Alternatives to LangChain

Open source LLM observability with OpenTelemetry tracing, evals, and prompt management for agents

Open-source LLM observability and agent evals: trace, evaluate, and improve AI agents on one MIT-licensed platform

Open-source LLMOps platform for tracing, agent simulations, evaluations and an AI gateway, from your own agents to the coding agents your engineers run.

CrewAI is an enterprise multi-agent platform: visual builder plus a governed control plane for production agent workflows.

OpenAI Agents SDK: a free Python framework for building multi-agent workflows with handoffs, guardrails, and sandbox agents

OpenTelemetry-native tracing and benchmarked LLM-judge evals for AI agents and RAG apps.

Open-source LLM observability and agent evaluation you can trace, self-host, and eval end to end.

Maxim AI pairs AI agent evaluation, simulation and observability with Bifrost, an open-source LLM gateway.

Open-source AI evaluation and observability for LLMs, RAG apps, AI agents, and ML models.

Open-source TypeScript framework for building AI agents, paired with the VoltOps console for tracing, evals, prompts, and deployment.

OpenTelemetry-native LLM tracing, evals, prompt management and GPU monitoring you can self-host free under Apache 2.0.

Open-source Python library that turns vibe checks into reproducible evaluation loops for RAG pipelines and AI agents.

OpenJudge is an Apache 2.0 open-source AI evaluation framework shipping 50+ benchmark-validated graders for agents, LLMs, code, math, and multimodal models.

Open-source benchmark that scores AI agents on real, multi-step software-company work tasks.

Render AI agent traces, tool calls and reasoning with open-source React components built for your own app.

PandaProbe is open-source agent observability that traces runs, evaluates outcomes, and converts failures into validated repair rules

Open-source collaboration layer for turning domain expertise into AI agent test suites

Braintrust delivers agent observability with evals, pattern discovery, and trace-scale storage in one platform.

Fiddler AI is an AI agent observability and control plane with inline guardrails, continuous evaluation, and auditable governance.

Open-source LLM observability, evaluation, and token-cost tracking you can self-host

Synth runs hosted coding-agent evals and optimizer loops with cited, reproducible research behind every result.

Galileo turns pre-launch AI evals into production guardrails that block bad agent and RAG responses at runtime.

Agnost AI monitors production AI agents, clusters silent failures, and opens a fix for review.

Agent monitoring and evals that surface recurring failures, search any pattern, and test fixes offline before you ship.

Open-source VLMEvalKit benchmarks 220+ vision-language models on 80+ multimodal tasks, with live rankings on the Open VLM Leaderboard.

Open-source benchmark that pits AI models against each other in 15-round coding arena tournaments.

Open-source PyTorch toolkit for feature attribution in sequence generation models

BALROG scores agentic LLM and VLM reasoning across seven procedurally generated games on an open leaderboard.

Observability and optimization for OpenClaw agents — trace failures, attribute cost, and ask Tracy what to fix.

Claw Lens is a zero-config local observability dashboard for OpenClaw AI agents — live monitor, cost analytics, and security audit in one