ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, awesome support, and a reasonable price tag.
AutoRABIT - Automated Release Management and Backup for Salesforce DevOps
Unleash - Open source Feature toggle/flag service. Helps developers decrease their time-to-market and to increase learning through experimentation.
Prefab.Cloud - Change Log Levels without restarting. Feature Flags. Dynamic Configuration. Focus on reliability and powerful features, but radically cheaper than alternatives.
FlipperCloud.io - Control Your Code. Instantly. Without configuring or deploying it.
LaunchDarkly - LaunchDarkly is a powerful development tool which allows software developers to roll out updates and new features.