Observability

Open-source LLM observability and evaluation, acquired by ClickHouse in 2026.

Comet's open-source LLM observability, evaluation and agent tracing platform.

OpenTelemetry-based LLM tracing and evaluation, licensed under ELv2.

Apache-2.0 LLM observability proxy, now reported to be in maintenance mode.

W&B's agent tracing and evaluation toolkit, SDK under Apache-2.0.

Eval-first AI observability platform with an open-source autoevals library.

Local-first observability dashboard for coding-agent runtimes such as OpenClaw.

Grafana Cloud's agent observability built on OpenTelemetry gen_ai spans.

Honeycomb's agent observability with Agent Timeline, built on OTel GenAI conventions.

LangChain's proprietary tracing, evaluation and monitoring platform.