The Open Source Endowment (OSE) is the world's first endowment fund specifically created to provide sustainable, long-term funding for critical open source software. Founded in 2025 by a diverse group of technology founders, executives, investors, and engineers, OSE addresses the systemic fragility of the global digital infrastructure by applying a traditional university-style endowment model to the open source ecosystem. By investing donations into a low-risk, diversified portfolio, the organization uses only the generated annual returns to provide grants, ensuring a stable, perpetual funding stream that is independent of volatile corporate budgets or temporary project-based donations. OSE is registered as a US 501(c)(3) tax-exempt public charity and maintains a commitment to transparency, data-driven decision-making, and community-led governance.

The organization functions as a lean, efficient nonprofit that bridges the funding gap for critical, yet often underfunded and non-commercializable, open source infrastructure projects. It focuses on the 'long tail' of software dependencies, identifying and supporting essential projects that lack corporate sponsors or commercial backing. OSE's operational strategy involves collecting community-driven project nominations, which are then analyzed through a comprehensive, data-driven framework. This model evaluates projects based on their ecosystem value and risk, such as dependency counts and maintainer availability, to prioritize microgrants of approximately $5,000 to highly impactful, at-risk software components.

Some of the key features are:

• Sustainable Funding Model: A perpetual endowment structure where only investment returns are used for grants, ensuring consistent support for OSS regardless of economic fluctuations.
• Data-Driven Grantmaking: A transparent, open-model framework that uses objective metrics—such as download counts, dependency chains, and project activity—to identify critical infrastructure for support.
• Community Governance: Donors contributing $1,000 or more annually are designated as OSE Members, with rights to advise on strategy, vote on organizational decisions, and appoint board directors.
• Transparent Operations: Full publication of board meeting minutes, financial documents, governance policies, and open access to their project-scoring model on GitHub.
• Neutrality and Independence: As a community-driven nonprofit, OSE remains independent from corporate, political, or specific commercial ecosystem influence.
• Systemic Support: Prioritizes independent, volunteer-led projects, specifically excluding VC-funded startups or projects with existing corporate ownership, to protect the independence of the OSS ecosystem.

OSE operates through a cycle of fundraising, professional asset management, and rigorous grantmaking processes. Donors, ranging from individuals to institutional partners, provide the principal capital which is managed by a professional outsourced chief investment officer, Infinite Giving. The Board of Directors, consisting of elected members and appointed directors, provides oversight and approves grant distributions based on the outcomes of their Value-Risk framework, following thorough due diligence. The goal is to provide sustainable, preventative financial assistance that empowers maintainers to improve project security, stability, and long-term viability.

Some common use cases include:

• Supporting Critical Infrastructure: Providing stability to essential, low-level libraries (e.g., C, Fortran, or utility packages) that are widely used but lack sufficient funding.
• Reducing Maintainer Burnout: Offering backward-looking awards to long-term contributors of essential projects to acknowledge their dedication and reduce volunteer fatigue.
• Preventative Security Measures: Funding specific, measurable development tasks intended to improve project security, fix latent vulnerabilities, or update outdated codebases before critical failures occur.
• Supporting Independent Maintainers: Enabling individual maintainers—often described as the 'random person in Nebraska'—to continue their work on vital but historically unrewarded open source projects.