We've built an open-source feature flag server for 11 years

Unleash is an open-source feature flag server that has been in development for 11 years, serving as a popular solution for feature management and deployment control. The platform allows teams to deploy code to production incrementally, test features with real production data, and work on multiple features simultaneously without separate branches. Unleash supports 15 official SDKs and over 15 community SDKs across any language and framework, with an enterprise version offering advanced features like role-based access control and single sign-on.