Private Limited Company

OPENCAST SOFTWARE EUROPE LIMITED

ActiveCompany 08047734United Kingdom
Bulk record snapshot1 OCT 2026Source details →

Registered office

STUDIO 2 THE KILN, HOULTS YARD, WALKER ROAD, NEWCASTLE UPON TYNE, ENGLAND, NE6 1AB
Incorporated26 April 2012
Company age14 years

TXT In plain English

Company description

BritDB description

OPENCAST SOFTWARE EUROPE LIMITED is a UK company whose Companies House status is “Active” and whose registered company type is “Private Limited Company”. Incorporated on 26 April 2012; registered for 14 years; registered office reported in NEWCASTLE UPON TYNE, ENGLAND. Its primary declared activity is 62020 · Information technology consultancy activities.

This BritDB profile also contains linked public records: 3 PSC records, 33 procurement records. This description is assembled from public data, is not a reliability assessment, and should be checked against the cited sources before a legally significant decision.

Prepared from public dataChecked 21 October 2026 · 10 profile sources connected
How this description is built →
i

Web facts are never added from a name match alone. Internet enrichment requires the exact Companies House ID in Wikidata, and ambiguous results are excluded.

01 Company overview

Identity and registration

Snapshot 1 October 2026
Official name
OPENCAST SOFTWARE EUROPE LIMITED
Company number
08047734
Company type
Private Limited Company
Status
Active
Country of origin
United Kingdom
Dissolution date
Not supplied
Accounts category
FULL
Mortgage charges
5 total · 2 outstanding · 3 satisfied
Limited partnership members
0 general · 0 limited
i

A registered office is not necessarily a trading location. The address is reproduced from the Companies House bulk record and should be interpreted in that legal context.

02 Filing dates

Accounts and statements

Companies House
AccountsBulk record

Last accounts made up to

31 December 2024

Next accounts due

30 September 2026
Confirmation statementBulk record

Last statement made up to

24 May 2026

Next statement due

7 June 2027
Filing source and official link →

BritDB does not infer overdue status when the source does not state it.

03 Workforce reporting

Gender pay gap

Reporting year 2025–2026
Employer size250 to 499
Median hourly gap6.3%
Mean hourly gap7.2%
Submitted18 February 2026
Submission deadline5 April 2026
Submission timingSubmitted by deadline
Median bonus gap
Not supplied
Mean bonus gap
Not supplied
Women receiving bonus
0.0%
Men receiving bonus
0.0%
Women in top quartile
32.0%
Women in upper middle quartile
35.0%
Women in lower middle quartile
36.0%
Women in lower quartile
50.0%
Earlier reporting years (2)
  1. 250 to 4994.7% median hourly gap
  2. 250 to 4996.5% median hourly gap
i

Positive gaps mean men were paid more; negative gaps mean women were paid more. These figures are employer-reported and describe the workforce distribution, not equal pay for the same job. The company link uses the exact Companies House number supplied by the service.

04 Supplier payments

Payment practices and performance

Period to 30 June 2026
Average time to pay28.0 days
Paid within 30 days61.0%
Paid after 60 days1.0%
Not paid within terms42.0%
Reporting period
1 January 2026 – 30 June 2026
Filed
17 July 2026
Shortest standard term
7 days
Longest standard term
30 days
E-invoicing offered
No
Supply-chain finance
Not offered
Payment codes
No
Construction retentions
No qualifying construction contracts
Complete reported payment fields
Policy regime
Regime-3
Financial period started
1 January 2026
Qualifying contracts
Yes
Payments made
Yes
Invoice value paid within 30 days
£7,222,130
Invoice value paid in 31–60 days
£3,101,240
Invoice value paid after 60 days
£270,296
Invoice value paid outside agreed terms
£3,693,844
Invoices paid in 31–60 days
38.0%
Invoices unpaid due to dispute
0.0%
Maximum contractual payment period
30 days
Supplier-list charging policy
No
Supplier-list charges made
No
Reported terms and dispute process
  1. Standard payment terms

    Our standard payment terms are net 30 days after receipt of invoice. Different payment terms are sometimes agreed with small/medium sized suppliers on a case by case basis.

  2. Dispute resolution process

    The supplier is advised to contact a dedicated email address for all invoices and payment disputes. A member of the team will respond to emails received as soon as possible. If the query cannot be resolved this will either be escalated to the relevant department or to Senior Management for further action.

i

This is a company-submitted statutory disclosure, not a credit rating. BritDB preserves the reporting period and links the report only through the Companies House number supplied by the official service. Percentages describe payments made during that period and may change in later reports.

05 Public procurement

Contracts Finder awards

Exact GB-COH links
active · 9 March 2026

NCC1646 BEST Digital and Data Partner

Northumberland County Council · ocds-b5fd17-d54a631b-7538-46c8-9b9e-9cfedf9ea9d9

Supplier named in award
Opencast Software Europe Ltd
Award value
£690,350
Contract period
9 March 2026 – 8 March 2027
Published
10 March 2026
Procedure
Call-off from a framework agreement
Main CPV
72222300
Source release ID
ocds-b5fd17-d54a631b-7538-46c8-9b9e-9cfedf9ea9d9-2026-03-10T15:06:24Z
active · 21 November 2024

HMPPS Digital Bench Model 2024 - Software Development Services

Ministry of Justice · ocds-b5fd17-1ee0bc50-f526-4faa-a3c0-fae1877d6bf3

Supplier named in award
Opencast Software Europe Limited
Award value
£8,250,000
Contract period
18 November 2024 – 17 November 2026
Published
22 November 2024
Procedure
Call-off from a framework agreement
Main CPV
72267000
Source release ID
ocds-b5fd17-1ee0bc50-f526-4faa-a3c0-fae1877d6bf3-2024-11-22T12:36:15Z
active · 15 October 2024

Legal Aid Agency Bench Model Software Development Services

Ministry of Justice · ocds-b5fd17-817a333c-4588-4e39-acd8-8cb74511a79c

Supplier named in award
Opencast Software Europe Limited
Award value
£9,960,000
Contract period
15 October 2024 – 14 April 2027
Published
8 November 2024
Procedure
Call-off from a framework agreement
Main CPV
72267000
Source release ID
ocds-b5fd17-817a333c-4588-4e39-acd8-8cb74511a79c-2024-11-08T11:14:38Z
active · 9 July 2024

Provision of DDaT Resources for DWP Product and Delivery Practice

Department for Work and Pensions · ocds-b5fd17-253fdf34-8305-4ae5-9d6f-4e223ca1f676

Supplier named in award
Opencast Software Europe Limited
Award value
£32,359,667.20
Contract period
9 July 2024 – 8 July 2026
Published
10 July 2024
Procedure
Call-off from a framework agreement
Main CPV
72222300
Source release ID
ocds-b5fd17-253fdf34-8305-4ae5-9d6f-4e223ca1f676-2024-07-10T14:32:00+01:00
active · 13 February 2024

Service Design and User Experience Support Service

Department for Work and Pensions · ocds-b5fd17-d0e1eefa-a08a-4f77-b72f-4de083c27cb1

Supplier named in award
Opencast Software Europe Limited
Award value
£152,238
Contract period
14 February 2024 – 29 March 2024
Published
29 February 2024
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-d0e1eefa-a08a-4f77-b72f-4de083c27cb1-2024-02-29T11:37:23Z
active · 26 January 2024

Consultancy and Advisory Services for Health

N H S Shared Business Services · ocds-b5fd17-20f5c8ec-6a0e-4e00-ad9a-ae8733f4e975

Supplier named in award
Opencast Software Europe Limited
Award value
£500,000,000
Contract period
18 March 2024 – 17 March 2028
Published
20 August 2024
Procedure
Open procedure (above threshold)
Main CPV
79411000
Source release ID
ocds-b5fd17-20f5c8ec-6a0e-4e00-ad9a-ae8733f4e975-2024-08-20T16:59:28+01:00
active · 31 December 2023

BAU Implementation

Department for Work and Pensions · ocds-b5fd17-d2a2d25c-1cc8-4c42-ab00-95d76cc5cd55

Supplier named in award
Opencast Software Europe Limited
Award value
£1,266,417
Contract period
1 November 2023 – 31 October 2024
Published
7 May 2024
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-d2a2d25c-1cc8-4c42-ab00-95d76cc5cd55-2024-05-07T12:31:00+01:00
active · 15 August 2023

Learner Data Service - Architecture Resource

Department for Education · ocds-b5fd17-c64e9783-1152-42f8-8976-a43bc5f0dbe0

Supplier named in award
Opencast Software Europe Ltd
Award value
£2,640,000
Contract period
15 August 2023 – 14 August 2024
Published
30 August 2023
Procedure
Call-off from a framework agreement
Main CPV
72222300
Source release ID
ocds-b5fd17-c64e9783-1152-42f8-8976-a43bc5f0dbe0-2023-08-30T15:21:57+01:00
active · 24 July 2023

Engineering Enablement

Department for Work and Pensions · ocds-b5fd17-8b230498-00d5-4bd8-bd12-8c92c78523e9

Supplier named in award
Opencast Software Europe Ltd
Award value
£537,600
Contract period
24 July 2023 – 12 January 2024
Published
21 August 2023
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-8b230498-00d5-4bd8-bd12-8c92c78523e9-2023-08-21T14:20:16+01:00
active · 28 June 2023

Agile Maturity Assessment

South Tyneside Council · ocds-b5fd17-af5ff4a7-e584-4d39-b4eb-993134bc2fd8

Supplier named in award
OPENCAST SOFTWARE EUROPE LIMITED
Award value
£29,850
Contract period
3 July 2023 – 30 September 2023
Published
5 July 2023
Procedure
Call-off from a framework agreement
Main CPV
48000000
Source release ID
ocds-b5fd17-af5ff4a7-e584-4d39-b4eb-993134bc2fd8-2023-07-05T09:18:17+01:00
active · 22 May 2023

Software Development Maturity Assessment - Phase 2

South Tyneside Council · ocds-b5fd17-2e130945-d2ce-4293-9815-038b22456f7e

Supplier named in award
OPENCAST SOFTWARE EUROPE LIMITED
Award value
£27,900
Contract period
19 June 2023 – 18 November 2023
Published
14 June 2023
Procedure
Call-off from a framework agreement
Main CPV
48000000
Source release ID
ocds-b5fd17-2e130945-d2ce-4293-9815-038b22456f7e-2023-06-14T11:19:45+01:00
active · 17 April 2023

CRCF - Children's Digital Common Platforms Strategic Projects

Department for Work and Pensions · ocds-b5fd17-3b4c5f85-4ce8-4600-8fec-a834cb2fa372

Supplier named in award
Opencast Software Europe LTD
Award value
£486,968.40
Contract period
17 April 2023 – 31 March 2024
Published
16 May 2023
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-3b4c5f85-4ce8-4600-8fec-a834cb2fa372-2023-05-16T17:03:08+01:00
active · 10 January 2023

External Change Notification Service (ECNS)

Department for Work and Pensions · ocds-b5fd17-1de5ffc3-6e17-4bb0-8a16-eb31edc8280c

Supplier named in award
Opencast Software Europe Limited
Award value
£1,376,400
Contract period
10 January 2023 – 9 January 2024
Published
25 January 2023
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-1de5ffc3-6e17-4bb0-8a16-eb31edc8280c-2023-01-25T10:50:51Z
active · 1 September 2022

FileTransfer BAU & Cloud Support

Department for Work and Pensions · ocds-b5fd17-0d51f144-2ccb-4ad1-bf62-f66191663942

Supplier named in award
Opencast Software Europe Limited
Award value
£991,290
Contract period
8 September 2022 – 31 March 2023
Published
30 March 2023
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-0d51f144-2ccb-4ad1-bf62-f66191663942-2023-03-30T13:34:24+01:00
active · 25 July 2022

Case & Correspondence Distribution System

ADVISORY, CONCILIATION AND ARBITRATION SERVICE · ocds-b5fd17-9cc6e396-eff7-4faa-afbe-50fc2f568a1b

Supplier named in award
OPENCAST SOFTWARE EUROPE LIMITED
Award value
£700,219.50
Contract period
1 August 2022 – 31 January 2024
Published
4 August 2022
Procedure
Call-off from a framework agreement
Main CPV
72222300
Source release ID
ocds-b5fd17-9cc6e396-eff7-4faa-afbe-50fc2f568a1b-2022-08-04T14:00:50+01:00
active · 23 May 2022

Secure Estate Digital Products

Ministry of Justice · ocds-b5fd17-408efee2-b9e7-4108-b5dd-a771c2d3016b

Supplier named in award
Opencast Software Europe Ltd
Award value
£1,000,000
Contract period
24 July 2022 – 23 July 2024
Published
22 July 2022
Procedure
Call-off from a framework agreement
Main CPV
71356300
Source release ID
ocds-b5fd17-408efee2-b9e7-4108-b5dd-a771c2d3016b-2022-07-22T10:21:12+01:00
active · 19 May 2022

SRA Enabling Team

Department for Work and Pensions · ocds-b5fd17-afecfe82-774b-4f34-88aa-6213fa7b75a4

Supplier named in award
Opencast Software Europe Limited
Award value
£799,410
Contract period
20 May 2022 – 13 December 2022
Published
23 May 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-afecfe82-774b-4f34-88aa-6213fa7b75a4-2022-05-23T12:33:04+01:00
active · 16 May 2022

Data Directorate Data Architecture & Data Governance Services 2022/24

Department for Education · ocds-b5fd17-2f36b53d-383e-4661-b627-98582e678551

Supplier named in award
Opencast Software Europe Ltd
Award value
£4,000,000
Contract period
16 May 2022 – 15 May 2024
Published
15 July 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-2f36b53d-383e-4661-b627-98582e678551-2022-07-15T13:23:02+01:00
active · 31 March 2022

Tactical Audit Migration

Department for Work and Pensions · ocds-b5fd17-5aed1838-580f-47ea-a640-9d4afd64989e

Supplier named in award
Opencast Software Europe Limited
Award value
£608,244
Contract period
1 April 2022 – 30 September 2022
Published
25 April 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-5aed1838-580f-47ea-a640-9d4afd64989e-2022-04-25T15:29:32+01:00
active · 28 February 2022

Architecture Service

Department for Work and Pensions · ocds-b5fd17-9d7ad2bb-a843-4e37-85e9-1be96727e97c

Supplier named in award
Opencast Software Europe Ltd 01912765656
Award value
£321,726
Contract period
1 March 2022 – 31 August 2022
Published
19 May 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-9d7ad2bb-a843-4e37-85e9-1be96727e97c-2022-05-19T10:19:04+01:00
active · 27 February 2022

Legacy Bridge Phase 2

Department for Work and Pensions · ocds-b5fd17-c8dfe193-71a7-4a10-992d-78880edf0eaf

Supplier named in award
Opencast Software Europe Ltd
Award value
£268,105
Contract period
1 March 2022 – 31 August 2022
Published
25 March 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-c8dfe193-71a7-4a10-992d-78880edf0eaf-2022-03-25T10:10:04Z
active · 3 January 2022

Digital Capability for Urgent DDaT Requirements

Government Digital Service · ocds-b5fd17-8c12ab61-7939-4072-b0fe-0104a5a58972

Supplier named in award
OPENCAST SOFTWARE EUROPE LIMITED
Award value
£3,000,000
Contract period
17 January 2022 – 16 January 2024
Published
31 May 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-8c12ab61-7939-4072-b0fe-0104a5a58972-2022-05-31T11:15:25+01:00
active · 22 November 2021

BAU support Q3 & Q4

Department for Work and Pensions · ocds-b5fd17-884473ca-75ab-443a-8695-00f82ce3396e

Supplier named in award
Opencast Software Europe LTD
Award value
£239,400
Contract period
22 November 2021 – 31 March 2022
Published
3 February 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-884473ca-75ab-443a-8695-00f82ce3396e-2022-02-03T10:30:14Z
active · 12 November 2021

Digital Delivery Centre support for new HMRC services

H M Revenue & Customs · ocds-b5fd17-2f5358fb-edf3-4ce4-9166-da97e0e413e6

Supplier named in award
OPENCAST SOFTWARE EUROPE LIMITED
Award value
£0
Contract period
11 November 2021 – 10 November 2023
Published
16 November 2021
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-2f5358fb-edf3-4ce4-9166-da97e0e413e6-2021-11-16T15:45:48Z
active · 1 November 2021

TYF Evergreen and BAU Requests

Department for Work and Pensions · ocds-b5fd17-98b0f0ab-2522-4cb8-8f19-f2f2592f6b0c

Supplier named in award
Opencast Software Europe LTD
Award value
£310,560
Contract period
1 November 2021 – 31 March 2022
Published
7 January 2022
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-98b0f0ab-2522-4cb8-8f19-f2f2592f6b0c-2022-01-07T11:05:17Z
active · 11 October 2021

DDaT21390 - ACAS Optimised Distribution

UK SHARED BUSINESS SERVICES LIMITED · ocds-b5fd17-565b95cc-ef76-42e3-aece-db04b4a89ff0

Supplier named in award
OPENCAST SOFTWARE EUROPE LIMITED
Award value
£855,682
Contract period
25 October 2021 – 7 April 2023
Published
10 November 2021
Procedure
Call-off from a framework agreement
Main CPV
48000000
Source release ID
ocds-b5fd17-565b95cc-ef76-42e3-aece-db04b4a89ff0-2021-11-10T12:50:49Z
active · 7 October 2021

Contract for the provision of Digital Workforce to Support NHS South, Central & West CSU

NHS SOUTH, CENTRAL AND WEST COMMISSIONING SUPPORT UNIT · ocds-b5fd17-996cc430-c87e-40db-81a7-9c926b52c72b

Supplier named in award
OPENCAST SOFTWARE LIMITED
Award value
£400,000
Contract period
7 October 2021 – 6 October 2023
Published
20 October 2021
Procedure
Call-off from a dynamic purchasing system
Main CPV
72610000
Source release ID
ocds-b5fd17-996cc430-c87e-40db-81a7-9c926b52c72b-2021-10-20T12:46:54+01:00
active · 19 August 2021

Green Zone Enabling Team

Department for Work and Pensions · ocds-b5fd17-33196a2a-822d-448b-9b59-3f7fca493b10

Supplier named in award
Opencast Software Europe LTD
Award value
£498,600
Contract period
23 August 2021 – 10 February 2022
Published
24 August 2021
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-33196a2a-822d-448b-9b59-3f7fca493b10-2021-08-24T09:51:21+01:00
active · 29 March 2021

Cloud Hosting and BAU Support-V1

Department for Work and Pensions · ocds-b5fd17-05ba0716-3204-4cb0-8405-58c8069f8198

Supplier named in award
Opencase Software Europe Ltd
Award value
£644,890
Contract period
1 April 2021 – 30 September 2021
Published
8 April 2021
Procedure
Call-off from a framework agreement
Main CPV
72000000
Source release ID
ocds-b5fd17-05ba0716-3204-4cb0-8405-58c8069f8198-2021-04-08T12:40:19+01:00
active · 8 March 2021

Employers Health and Inclusive Employment Alpha

Department for Work and Pensions · ocds-b5fd17-541f7108-650b-4cb7-96fb-10171c37e421

Supplier named in award
Opencast Software Europe Ltd
Award value
£285,775
Contract period
8 March 2021 – 24 May 2021
Published
21 May 2021
Procedure
Call-off from a framework agreement
Main CPV
72222300
Source release ID
ocds-b5fd17-541f7108-650b-4cb7-96fb-10171c37e421-2021-05-21T09:08:03+01:00
i

The supplier link is exact, but the award remains buyer-published procurement data. BritDB requires the GB-COH identifier supplied in the Contracts Finder OCDS release and does not infer suppliers from similar names.

06 Ownership and control

People with significant control

Snapshot 17 October 2026
Current records1
Ceased records2
PSC source and official link →
Corporate entityCurrent

Opencast Software Europe Holdings Limited

  • Owns 75% or more of shares
  • Controls 75% or more of voting rights
  • Can appoint or remove directors
Country registered
United Kingdom
Legal authority
Companies Act 2006
Legal form
Private Limited Company
Place registered
Uk Companies House
Registration number
15132278
Notified
12 February 2024
i

PSC records are company-filed public-register information. When the exact same displayed individual name occurs at multiple companies, BritDB offers a non-indexed cross-reference page. It is a name match only, not proof that the records describe the same person. Service addresses and partial dates of birth are deliberately omitted.

07 Charity register

Charity Commission links

Snapshot 29 September 2026
CCEW

No exact company-number link in this snapshot

The Charity Commission extract did not explicitly associate this Companies House number with a charity. BritDB does not use a name-only match to fill the gap.

i

This company-level check covers the Charity Commission for England and Wales. Links are accepted only when the official extract supplies this exact company registration number. Scottish charities now have separate OSCR profiles, but OSCR’s bulk fields do not provide a Companies House number, so BritDB does not infer a company link.

08 Northern Ireland charity register

CCNI exact company links

Snapshot 29 September 2026
CCNI

No unambiguous company-number link found

The CCNI source number did not resolve uniquely to this Companies House record. BritDB did not use a name or address match.

i

CCNI publishes company numbers without a jurisdiction prefix. BritDB links only when the plausible padded UK and NI candidates resolve to exactly one Companies House company.

09 Sanctions screening

UK Sanctions List

Report 16 October 2026
UKSL

No exact business-registration-number link found

The imported UK Sanctions List did not supply this Companies House number as a UK-linked business identifier. BritDB did not attempt a name-only match.

!

No exact link is not sanctions clearance. UK restrictions can apply through ownership or control even where an entity is not separately named. Always use the current official list and obtain appropriate advice for a legally significant decision.

10 Public procurement

Find a Tender links

Snapshot 29 September 2026
i

These links use only the GB-COH identifier supplied in the procurement record. A company may have other public-sector work that is absent, older, below publication thresholds or published without a Companies House identifier.

11 Environmental register

Environment Agency waste registrations

Snapshot 29 September 2026
EA

No exact company-number registration linked

The licensed Environment Agency subset did not contain this exact Companies House number. BritDB did not attempt a name-only match.

i

This is a privacy-reduced, exact-company subset. The full official register also includes sole traders and applicants without a matching Companies House number. Check the current Environment Agency register before relying on registration status.

12 Nature of business

Standard Industrial Classification

SIC 2007

13 Connected public record

Checks beyond the company register

Partial coverage
CCEW

Charity Commission

0 exact company-number links.

Checked
CCNI

Northern Ireland charities

0 unambiguous company-number links.

Checked
FTS

Public contracts

3 procurement processes linked by exact GB-COH identifier.

Checked
EA

Waste register

0 exact company-number registrations.

Checked
GZ

Corporate notices

The Gazette is not yet connected.

Not checked
UKSL

UK Sanctions List

No exact business-registration-number link in this report.

Checked
!

A checked source with no exact link is not a clean bill of health. Unchecked sources remain unknown, while sanctions may also apply through ownership or control of a listed person or entity.

14 Record timeline

Dates in the bulk record

3 events
  1. Confirmation statement

    Latest confirmation statement made up to this date

  2. Accounts

    Latest accounts made up to this date

  3. Incorporation

    Company incorporated

15 Provenance

Sources for this profile

10 sources

Companies House, Charity Commission, OSCR and UK Sanctions List information is public-register data. BritDB reproduces and organises it with source-specific limits; official external links are kept on the dedicated source pages.