Unleash

Unleash is an open-source feature management platform that lets teams control when and how new features reach users, independently of when code is deployed. Feature flags let a team ship code to production already, then turn a feature on for a subset of users - or roll it back instantly - without a new deployment, and let multiple features be developed and tested with real production data simultaneously rather than coordinating long-lived feature branches.

It supports gradual rollouts, targeting rules, and the kind of controlled experimentation feature flags are commonly used for, with client SDKs across many languages and both a self-hosted deployment and a managed Unleash offering.

Unleash is a fit for teams that want to decouple releasing code from releasing features - reducing the risk of any single deployment - rather than relying on deployment-time feature toggles or long-lived branches.