Open source alternatives to Optimizely

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growthbookv5.2.0growthbook/growthbook

Open Source Feature Flags, Experimentation, and Product Analytics

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posthogdesktop-v0.61.1040PostHog/posthog

:hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error tracking, logs, and more – capture all the context agents need to diagnose problems, uncover opportunities, and ship fixes. Steer it all from Slack, web, desktop, or the MCP.