Open Source Backend Development Tools

Alternative toAnyscale

Enterprise-grade RL framework for LLM post-training at scale

• 3,175 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toiText 7

Open source Java library for creating and parsing PDFs

• 3,133 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toOrb

Open-source billing layer over Stripe for usage and credits

• 2,831 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toFireworks AI

MIT-licensed LLM inference engine built for agentic coding workloads.

• 2,715 GitHub stars
• MITLicence MIT
• #LLM

Alternative toApigee

Build, document, and monetize APIs from one self-hosted platform

• 2,127 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toFirebase

Self-hosted backend with real-time API and search built in

• 1,668 GitHub stars
• Apache-2.0Licence Apache-2.0
• #BaaS

Alternative toAmplitude

Open source analytics infrastructure powered by ClickHouse

• 1,662 GitHub stars
• MITLicence MIT

Alternative toVectara

Open source RAG framework for any dataset or LLM

• 678 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toClaude Code

Pi's coding agent, in Go. One binary, no Node.js required.

• 657 GitHub stars
• MITLicence MIT

Alternative toStripe Connect

Open source payout platform for global marketplace payments

• 566 GitHub stars
• Apache-2.0Licence Apache-2.0