grants.watch

Free and Open Source Software Sustainability Fund · Open Source · Grants

Free and Open Source Software Sustainability Fund

OTF's fund for the sustainability of free and open source software used for internet freedom, making targeted awards (from $7k/month up to $400k over 24 months) for maintenance, interoperability, security, and resilience of FOSS tools. Awards run through a two-stage competitive process (concept note, then proposal with advisory council review) as deliverable-based performance contracts; supported projects include F-Droid, DEfO, and Mailvelope, and an application round ran March-May 2026.

Who can apply

Eligibility
Not recorded. Check the funder's terms.
Location
Not recorded. Check the funder's terms.
Funding
Not recorded. Check the funder's terms.

Round history

RoundWindowSizeSource
March-May 2026 roundMarch 2026 to May 7, 2026ClosedNot statedopentech.fund

Past rounds stay on the page, so you can see how often this program opens.

Funding evidence

Funding evidence is temporarily unavailable. The existing program record remains available above.

Sources

  1. 01opentech.fund/funds/free-and-open-source-software-sustainability-fund/
  2. 02opentech.fund/projects-we-support/supported-projects/f-droid-sustainability/
  3. 03opentech.fund/projects-we-support/supported-projects/mailvelope/

Awards

6 on file
Showing 1-6 of 6, newest dated evidence first
  1. DEfO Sustainability
    AmountFunding to date $721,958 (most recent grant 2023)
    Date–
    Source ↗
  2. F-Droid Sustainability
    AmountFunding to date $396,044 (most recent grant 2025)
    Date–
    Source ↗
  3. Mailvelope Sustainability
    AmountFunding to date $829,330 (cumulative; most recent grant 2023)
    Date–
    Source ↗
  4. OpenVPN Community Maintenance and Sustainability
    AmountFunding to date $452,524 (cumulative; most recent grant 2023)
    Date–
    Source ↗
  5. Tails
    AmountFunding to date $972,620 (cumulative; most recent grant 2023)
    Date–
    Source ↗
  6. Transitioning Tor Browser to Firefox ESR 140
    AmountFunding to date $398,382 (most recent grant 2025)
    Date–
    Source ↗