ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, awesome support, and a reasonable price tag.
Nonfig - We are"Google Docs" for Software Configurations. You can store, modify, and control Software Behaviors from a simple Workspace and collaborate today! Drive changes without deploying the code
Switchover Feature Flag Management - Feature Flag Management made easy.
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.
Unleash - Open source Feature toggle/flag service. Helps developers decrease their time-to-market and to increase learning through experimentation.
CloudBees Feature Management - Security - CloudBees Feature Management