Open Source APIs & Integration Tools

Alternative toOpenRouter

One API gateway for Claude, OpenAI, Gemini, and Grok subscriptions

• 44,454 GitHub stars
• LGPL-3.0Licence LGPL-3.0

Alternative toUnstructured.io

Convert documents to clean markdown and JSON with open source AI.

• 40,566 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toCourier

Open source notification infrastructure for product teams

• 40,175 GitHub stars
• MITLicence MIT

Alternative toContentful

Wrap any SQL database with REST and GraphQL APIs and an admin UI

• 38,631 GitHub stars

Alternative toOpenRouter

One OpenAI-compatible key for 635 free LLM endpoints

• 38,191 GitHub stars
• MITLicence MIT
• #LLM

Alternative toMem0

Add persistent user memory to any LLM app via API, Apache 2.0

• 31,339 GitHub stars
• MITLicence MIT
• #AI Agents

Alternative toShopify

Laravel eCommerce with headless API and no transaction fees

• 28,259 GitHub stars
• MITLicence MIT

Alternative toAlgolia

Fast typo-tolerant search engine with instant results

• 27,014 GitHub stars
• GPL-3.0Licence GPL-3.0

Alternative toZapier

Build AI-powered automations and agents without vendor lock-in

• 25,140 GitHub stars
• MITLicence MIT

InDeveloper Tools

Parse gigabytes of JSON per second with SIMD instructions

• 24,438 GitHub stars
• Apache-2.0Licence Apache-2.0