RegistryProgramsFree and Open Source Software Sustainability FundFree and Open Source Software Sustainability Fund
Program profile: sourced & linkedProgram · Grants · Free and Open Source Software Sustainability Fund
Free and Open Source Software Sustainability Fund
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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.
Rounds
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Awards
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RecipientAmountDateEvidence
- DEfO SustainabilityAmountFunding to date $721,958 (most recent grant 2023)Date–
- F-Droid SustainabilityAmountFunding to date $396,044 (most recent grant 2025)Date–
- Mailvelope SustainabilityAmountFunding to date $829,330 (cumulative; most recent grant 2023)Date–
- OpenVPN Community Maintenance and SustainabilityAmountFunding to date $452,524 (cumulative; most recent grant 2023)Date–
- TailsAmountFunding to date $972,620 (cumulative; most recent grant 2023)Date–
- Transitioning Tor Browser to Firefox ESR 140AmountFunding to date $398,382 (most recent grant 2025)Date–