Open Source LLM Observability & Evaluation using Express
A curated collection of the best open source tracing, monitoring, and evaluation platforms for LLM and AI-agent applications. using Express.
Open source LLM engineering platform for AI-powered applications
Stars
35,032Last commit
11 hours agoLicense
MIT
Langfuse provides tracing, evaluations, prompt management, and analytics to debug and improve LLM applications.
Open Source Alternative to:
Open-source LLM tracing & evaluation for AI optimization
Stars
11,607Last commit
12 hours agoLicense
Elastic-2.0
Open-source platform for LLM tracing, evaluation, and optimization. Features automatic instrumentation, prompt playground, and real-time AI application monitoring.
Open Source Alternative to:
Build reliable AI apps with comprehensive observability
Stars
6,175Last commit
9 days agoLicense
Apache-2.0
Open-source platform for logging, monitoring, and debugging LLM applications. Route, debug, and analyze AI apps with comprehensive observability tools.
Open Source Alternative to:
Simulation-based testing and evaluation for AI agents
Stars
4,872Last commit
17 hours agoLicense
Apache-2.0
Tests AI agents through multi-turn simulations, LLM-based scoring, and production tracing so teams can ship reliable agents with confidence.
Open Source Alternative to:
Sent – A unified API for sending messages across SMS, RCS, and apps like WhatsApp.
Sent