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Flagsmith/flagsmith
Flagsmith is an open source feature flagging and remote config service. Self-host or use our hosted version at https://app.flagsmith.com.
Flagsmith is a self-hostable feature flag and remote config service with a Django API, React admin dashboard, and SDKs for 15+ languages. Targets teams that want feature flags/A/B testing without vendor lock-in or want to run it on their own infra.
Mature codebase with real production concerns handled: Postgres, ClickHouse and InfluxDB backends for analytics at different scale tiers, an edge API layer for identity-based flag evaluation, MFA/oauth auth, and a proper migration history going back years. CI setup is extensive (separate pipelines for api/frontend/docs/mcp, ECS deploys, trivy scanning) which signals this actually runs in production somewhere serious. Docker-compose gets you a working instance in one command.
Open-core model means the interesting enterprise governance/RBAC features are gated behind a paid license, so 'open source' here is really 'open core' - read the fine print before committing infra around it. The API codebase is large and sprawling (dozens of Django apps), which means onboarding a contributor or auditing the codebase takes real time. Self-hosting for real scale requires running Postgres + Redis + optionally ClickHouse/Influx, so the 'one command' demo undersells the operational footprint for production use.