API Infrastructure Open Source Tools

Alternative toFirebase

Open source Firebase: Postgres database, auth, and file storage

• 112,232 GitHub stars
• Apache-2.0Licence Apache-2.0
• #BaaS

Alternative toTogether AI

High-throughput LLM inference server with OpenAI-compatible API

• 94,441 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toOpenRouter

352-provider AI gateway with automatic fallback and token compression

• 78,353 GitHub stars
• MITLicence MIT
• #LLM

Alternative toAmazon ElastiCache for Redis

High-performance open source in-memory data structure store

• 77,034 GitHub stars
• #Database

Alternative toMicrosoft Power BI

Open source data visualization and BI exploration tool

• 75,219 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toLSEG Workspace (formerly Refinitiv Eikon)

Open source AI research workspace for financial analysis

• 74,512 GitHub stars
• Apache-2.0Licence Apache-2.0
• #AI Agents

Alternative toNGINX Plus

Auto-routing reverse proxy for Docker and Kubernetes from labels

• 65,290 GitHub stars
• MITLicence MIT

Alternative toFirebase

Self-hosted backend: auth, databases, storage, and functions

• 57,737 GitHub stars
• BSD-3-ClauseLicence BSD-3-Clause

Alternative toCalendly

MIT self-hosted scheduling without Cal.com enterprise code

• 49,183 GitHub stars
• MITLicence MIT

Alternative toOpenRouter

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

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