Open source is at the core of everything we do at GitBook — it’s where we started, and it’s still fundamental to everything we build today.

As part of our continued membership in the Open Source Pledge, we’re sharing our 2025 contributions. This year, we had 15 developers on our team and paid a total of $34,054 directly to open source maintainers and foundations.

GitHub sponsorships

• Unifiedjs — $12,000

• Dmonad (yjs) — $6,000

• Drizzle — $3,000

• ESLint — $2,400

• Node — $550

• Fumadocs — $704

• Wooorm — $600

• Isaacs — $600

• CSSTools — $600

• Mike Ralphson — $600

• Sindre Sorhus — $240

• Cheerio — $180

• Babel — $180

• Sasha Koss — $180

• Evgeny — $180

• Andrey Sitnik — $180

Open Collective sponsorships

• Storybook — $1,500

• PostCSS & Autoprefixer — $1,200

• typescript-eslint — $1,200

• Vitest — $600

• webpack — $600

• Vale — $100

• Stylelint — $120

• libvips — $180

• core-js — $180

Thank you to every maintainer and contributor who makes open source software an incredible resource for everyone. We’re incredibly proud to support your work.

If you want to publish docs for your open source project for free, check out GitBook for Open Source.