# Essential Open Source Software for Science

**Funder:** Chan Zuckerberg Initiative, Wellcome Trust, The Kavli Foundation
**Budget:** $100,000–$400,000 USD
**Duration:** 2 years
**Consortium:** No
**Application:** 2-stage: Letter of Intent → Full Application
**Frequency:** Recurring
**Official call:** https://chanzuckerberg.com/rfa/essential-open-source-software-for-science/
**Last verified:** 22 March 2026

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Source: [The Great Grantsby](https://grantsby.eu/grants/chan-zuckerberg-initiative-wellcome-trust-the-kavl-essential-open-source-software-for-science-2026) — EU grant monitoring for academic researchers. Always verify details on the funder's website before applying.