Open-source projects can seek funding beyond GitHub Sponsors through thematic grants, public-interest infrastructure funds, regional programs, corporate sponsorships, and security initiatives. These routes are not interchangeable: each has its own scope, geography, licensing rules, application method, and timeline. Start by matching a specific, budgeted piece of work to a program—not by assuming every fund accepts general requests for project support.
Which open-source funding route fits your project?
These programs differ in who can apply, what work they support, and how funding is awarded. Check the current official criteria before preparing an application; calls, eligibility rules, and deadlines can change.
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| Route | Best fit | How funding is accessed | Key constraint |
|---|---|---|---|
| NLnet and thematic calls | Open internet infrastructure, security, standards, social protocols, and related work | Apply to a relevant fund or specific call | Scope and eligibility vary by fund; open licensing requirements apply |
| Sovereign Tech Fund | Foundational digital technologies on which other software or networks depend | Submit a proposal for eligible work | Proposed work must cost more than €50,000; prototypes and certain overlapping public-funded activities are excluded |
| FOSS United | FOSS projects, maintainers, fellowships, and events in India | Use the relevant project-grant, fellowship, or event route | Geographically focused on India |
| Microsoft FOSS Fund | Eligible projects used by Microsoft that have an internal advocate | Microsoft employees and interns nominate projects | Not an open self-service application |
| Open-source security ecosystem funding | Security work coordinated through ecosystem organizations | Check Alpha-Omega and OpenSSF for current opportunities | The announced funding is not itself a general grant application |
What grants can open-source projects apply for?
NLnet: match the work to a fund or call
NLnet says individuals, research organizations, nonprofits, public institutions, and companies may apply in principle, while noting that each fund can add eligibility conditions. Its general baseline requires scientific outcomes to be open access and software or hardware produced by funded work to be published entirely under a recognized free/open-source license. Listed areas include internet infrastructure, security, software supply-chain management, reproducibility, trust-enhancing technologies, standards, social protocols, and research and higher-education networks. The NLnet funding page describes the broader routes, including the Open Social Fund for auxiliary work connected to decentralized social technology.
One time-sensitive example is Restack. NLnet says its first call opened September 3, 2026, and closes November 3, 2026, at 12:00 CET. It aims to mature and scale operational internet commons across the technology stack, with examples ranging from open hardware and middleware to productivity tools and local-first infrastructure. This is a specific thematic call, not a general grant for any open-source project. Review the Restack call page for its scope and eligibility before applying.
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Sovereign Tech Fund: propose work on foundational technology
The Sovereign Tech Fund supports open digital base technologies that are important to other software or digital networking. Its examples include programming-language libraries, package managers, open protocol implementations, developer administration tools, and encryption technologies. The fund says it is not currently seeking user-facing applications such as messaging or file-storage services, and it does not finance prototypes.
Under the fund’s published criteria, supported code and documentation must be freely reusable, changeable, and redistributable under acceptable license families. The proposed work must cost more than €50,000, and the same proposed activities cannot already receive public financing from another public entity. The fund assesses factors including prevalence, societal relevance, vulnerability or structural underfunding, public interest, planned work, and team expertise.
Plan around a long decision path rather than urgent cash needs. The fund’s published process allows up to 10 weeks for initial review, up to 8 weeks for scoping and expert consultation, and up to 8 weeks for legal and contract preparation. It estimates about six months from application to a potential contract start.
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FOSS United describes its grants as support for FOSS creators, maintainers, projects, and events across India. Project grants are largely non-thematic; examples include developer tools, consumer applications, nonprofit foundations, mirrors, open hardware, individual contributors, and programming languages. The organization also offers fellowships for individuals contributing to projects and communities, as well as event grants.
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FOSS United reports that it has disbursed more than INR 3 crores to Indian FOSS projects and maintainers to date. That is the organization’s own cumulative figure, not an independent estimate of open-source funding overall. Check the current program criteria and application page for the route that fits your work.
Microsoft FOSS Fund: nomination, not open application
The Microsoft FOSS Fund is a corporate sponsorship program in which Microsoft employees and interns nominate projects. The published rules require a nominated project to be used by Microsoft, use an OSI-approved license, have a funding-receipt method acceptable to Microsoft’s procurement and legal teams, and not be owned by a Microsoft employee. GitHub Sponsors is the preferred receipt method.
Microsoft describes quarterly distributions of up to $12,500 USD across one or more projects. The route is relevant only if a plausible internal nominator exists and the project meets the stated conditions; it is not a way to submit an unsolicited application directly.
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On March 17, 2026, the Linux Foundation announced $12.5 million in grants from Anthropic, AWS, GitHub, Google, Google DeepMind, Microsoft, and OpenAI to strengthen open-source security. Its announcement says Alpha-Omega and OpenSSF will manage the funding and work with maintainers and communities on sustainable security solutions, including security-report triage and remediation.
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The announcement describes an ecosystem investment; it does not establish an open application available to every project. Security-focused maintainers should check Alpha-Omega and OpenSSF for current routes and eligibility rather than treating the announcement as a grant call.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you choose between grants and sponsorships?
Use the program’s actual mechanism and requirements to narrow your options. A sponsorship profile can make it possible to receive money, but it does not replace a grant proposal, satisfy a call’s eligibility rules, or create an internal nomination.
- Geography: Is the program open internationally, regional, or restricted to a jurisdiction?
- Project scope: Does it support foundational infrastructure, security, internet commons, research, community work, or FOSS projects more broadly?
- Work type: Is the request for maintenance, feature development, security, documentation, prototype work, or an event? Are prototypes excluded?
- Award mechanism: Is there an open application, a deadline-bound call, an employee nomination, or a managed ecosystem investment?
- Applicant and payment: Can an individual apply, or is an organization or fiscal host needed? Can the applicant legally receive funds?
- License and outputs: Must code, hardware, documentation, or research outputs meet specified open-license or open-access terms?
- Budget and schedule: Is there a minimum or maximum scope, which costs are eligible, and how long could a decision and start take?
- Existing funding: Does overlapping public funding make the work ineligible, and can the proposal identify an unmet need?
These checks matter in practice: the Sovereign Tech Fund focuses on foundational technologies and sets a minimum project cost and public-funding restriction; NLnet has fund-specific scope and licensing rules; FOSS United focuses on India; and Microsoft’s route depends on nomination.
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Define a bounded work package before writing. “Support this project” is difficult to assess; a concrete request connects a need, a plan, a budget, and an outcome.
- Describe the work: State what you will build, maintain, document, secure, or deliver, and what will be out of scope.
- Show who relies on it: Explain the software’s role and who depends on it, especially where the program asks about public value or foundational importance.
- Explain the funding gap: Identify why this work is not currently funded and what would otherwise remain undone.
- Set deliverables and ownership: Name the people doing the work, define observable outcomes, and explain how results will be maintained and made publicly available.
- Build a realistic budget: Tie requested costs to the work package and confirm which costs the program permits.
- Screen eligibility before applying: Verify jurisdiction, applicant or payment structure, licensing, deadline, duplicate-funding rules, and likely award timing against the official program page.
Is there a single pool of funding for open source?
No single figure here represents the overall amount or distribution of open-source funding. The program figures above describe particular organizations or initiatives: for example, FOSS United’s cumulative disbursement is its own reported total, while the Linux Foundation’s $12.5 million announcement concerns a specific security effort. Treat each as evidence about that route, not as a measure of the entire funding landscape.
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