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Langfuse (part of ClickHouse, Inc. since January 2026) · Prompting, evaluation & observability

Open-source LLM observability and evaluation platform: tracing, LLM-as-judge and human evals, prompt management, datasets and cost dashboards, self-hostable or as Langfuse Cloud

MITOpen sourceFreemiumSelf-hostedNov 2, 2026

Prefect

Prefect Technologies, Inc. · ETL/ELT & orchestration

Python workflow orchestration library and server where decorated functions become observable, retryable flows, with Prefect Cloud as hosted option

Apache-2.0Open sourceFreemiumLocalSelf-hostedRedirected

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Prefect