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Braintrust

Braintrust Data, Inc. · Prompting, evaluation & observability

Hosted observability and evaluation platform for AI agents with tracing, experiments, pattern detection, a CLI, MCP access and an AI assistant (Loop) that analyzes traces and builds evals

MixedFreemiumPaidNov 2, 2026

Prometheus

Prometheus Authors / Cloud Native Computing Foundation · Monitoring & observability

Pull-based metrics monitoring system and time-series database with the PromQL query language, service discovery and the Alertmanager component

Apache-2.0Open sourceFreeSelf-hostedBroken

Weights & Biases

CoreWeave · Training & fine-tuning

ML experiment tracking, sweeps, artifacts and model registry plus Weave for LLM tracing and evaluation, now sold by CoreWeave within its Forge platform with a free academic tier

MITFreemiumPaidSelf-hostedBroken

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