PostHog— Open-source product analytics, session replay, feature flags, and A/B testing suite

PostHog is an all-in-one developer-focused product analytics platform that combines event autocapture, session recordings, feature flags, user surveys, and multivariate experiments into a single self-hostable deployment. - **Primary Use Case**: Understand product usage and debug user sessions without sharing customer data with third parties. - **Who It Is Built For**: Product engineers, growth leads, and privacy-conscious software companies. - **Standout Capability**: High-performance ClickHouse analytical backend capable of querying millions of events in seconds. - **Licensing & Architecture**: Open core under MIT with full Docker and Kubernetes deployment recipes.