ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, awesome support, and a reasonable price tag.

DevCycle - DevCycle helps modern product engineering teams release code faster and safer.

Unleash - Unleash is an open-source feature management platform. We are private, secure, and ready for the most complex setups out of the box.

Flagsmith - Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Fipper.io - Feature toggle solution

LaunchDarkly - LaunchDarkly is a powerful development tool which allows software developers to roll out updates and new features.