Who funds them, what they fund and how to apply.
Mozilla Open Source Support's Foundational Technology track funded open-source software that Mozilla relies on in its products, infrastructure, or internal work. MOSS has been on indefinite hiatus since the 2020 Mozilla restructuring and is not accepting applications.
The Mozilla Technology Fund (MTF) gave awards of up to $50,000 plus a 12-month mentorship cohort to open-source projects tackling a themed public-interest technology challenge each round. The latest sourced cohort is the 2024 AI and Environmental Justice round; no later public call is on file.
Small grants to help NumFOCUS's fiscally sponsored and affiliated open-source scientific computing projects improve usability, grow their communities, and speed release cycles. Calls for proposals normally run 3x/year; applications are currently closed while NumFOCUS updates its financial and administrative systems.
Multi-donor fund administered by Renaissance Philanthropy, seeded with support from the Chan Zuckerberg Initiative, Biohub, and Wellcome Trust, funding open-source software infrastructure for science. The inaugural 2026 OS4LS call is closed. The apply page shows no open opportunities as of 2026-08-29.
Inaugural OS4LS RFA of the Open Source for Science Fund. LOI due 2026-06-08; full proposals due 2026-07-21. Submissions are closed. Award notifications expected October 2026.
EUR 10M Horizon Europe cascade-funding programme led by NLnet with FSFE and other partners, offering EUR 5,000-50,000 R&D grants with rolling calls every two months (2026-2030) plus a scale-up track, across open-tech sovereignty/privacy, internet resilience, environmental impact, and supply-chain transparency. NLnet currently describes the fund as being set up; the first recorded call is closed and the next window is not yet confirmed on the Restack page.
Annual bounty-driven contribution event for open-source quantum software, open to developers worldwide. UnitaryHACK 2026 ran 3-17 June and has closed; the 2027 event is not yet announced.
Status describes whether a program is running. Application methods are recorded separately. Read the funder’s terms before applying.