Open Source APIs & Integration Tools

Alternative toFirebase

Firebase alternative: GraphQL, Postgres auth, and file storage

• 9,364 GitHub stars
• MITLicence MIT
• #BaaS

Alternative toPortkey

Open-source AI gateway with 23+ providers, failover, and MCP support.

• 8,975 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toShopify

Headless Symfony commerce for complex B2B and B2C stores

• 8,560 GitHub stars
• MITLicence MIT

Alternative toCouchbase Capella

NoSQL database with multi-primary sync and HTTP API

• 6,981 GitHub stars
• Apache-2.0Licence Apache-2.0
• #Database

Alternative toEmbedEZ

Rich X and Bluesky embeds for Discord and Telegram

• 5,759 GitHub stars
• MITLicence MIT

Alternative toPusher

Self-hosted Pusher-compatible WebSocket server, open source

• 5,635 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toKong Konnect

Unified API keys, gateways, and observability for developers.

• 5,471 GitHub stars
• FSL-1.1-ALv2Licence FSL-1.1-ALv2

Alternative toTwilio

Self-hosted WhatsApp REST API with multi-account and webhook support

• 4,937 GitHub stars
• MITLicence MIT
• #Chatbots

Alternative toSlack

Open protocol for secure, decentralized messaging and VoIP

• 4,716 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toGoogle Gemini Enterprise Agent Platform

Agentic AI framework for the JVM

• 4,524 GitHub stars
• Apache-2.0Licence Apache-2.0
• #AI Agents