PostHog Product analytics, session recording, feature flagging and a/b testing that you can self-host (alternative to Mixpanel, Amplitude, Heap, HotJar, Optimizely). Self-hostedOpen sourceAnalyticsSoftware Development - Feature Toggle 40,481MITPythonupdated Oct 2026
F Flagsmith Dashboard, API and SDKs for adding Feature Flags to your applications (alternative to LaunchDarkly). Self-hostedOpen sourceSoftware Development - Feature Toggle 6,626BSD-3-ClauseDockerupdated Oct 2026
F Flipt Feature flag solution with support for multiple data backends (alternative to LaunchDarkly). Self-hostedOpen sourceSoftware Development - Feature Toggle 4,930GPL-3.0Goupdated Oct 2026
G GO Feature Flag Simple, complete, and lightweight feature flag solution (alternative to LaunchDarkly). Self-hostedOpen sourceSoftware Development - Feature Toggle 2,125MITGoupdated Oct 2026
F Featbit Enterprise-grade feature flag platform that you can self-host. Self-hostedOpen sourceSoftware Development - Feature Toggle 1,948MITDockerupdated Oct 2026
N Nona Remote configuration and feature flag service with a single REST API, multiple environments, and official JavaScript and .NET clients (alternative to Firebase Remote Config). Self-hostedOpen sourceSoftware Development - Feature Toggle 50Apache-2.0Dockerupdated Sept 2026