API Development Open Source Tools

Alternative toSublime Text

Hyperextensible Vim-based editor with Lua plugin support

• 103,088 GitHub stars
• Apache-2.0Licence Apache-2.0
• #Coding

Alternative toLlamaParse

Document parsing for LLM workflows, OCR, and agent reading.

• 82,142 GitHub stars
• CustomLicence Apache-2.0 with commercial threshold and attribution terms
• #LLM

Alternative toPostman

Open source Postman alternative for REST and GraphQL testing

• 80,662 GitHub stars
• MITLicence MIT

Alternative toContentful

Headless CMS with auto-generated REST and GraphQL for any content model.

• 73,351 GitHub stars
• MITLicence MIT

Alternative toXBOW

Autonomous AI pentesting with proof-of-exploit and auto-fix PRs.

• 70,381 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toAWS Elemental MediaConvert

Record, convert, and stream audio and video on any platform

• 65,465 GitHub stars
• #Video

Alternative toAirtable

Turn any database into a no-code spreadsheet. Self-hostable.

• 65,308 GitHub stars
• #No Code

Alternative toPortkey

Self-hosted AI gateway for 100+ LLMs in OpenAI format

• 61,759 GitHub stars
• CustomLicence MIT with enterprise directory carve-out
• #LLM

Alternative toContentful

Build code-first CMS backends with TypeScript schemas

• 45,369 GitHub stars
• MITLicence MIT

Alternative toMotherDuck

Fast in-process SQL analytics database, no server needed

• 42,318 GitHub stars
• MITLicence MIT
• #Database