Free ConfigCat Teacher plan is available. It allows you to create lots of feature flags and manage an unlimited number of student groups.
ConfigCat is a feature flag and configuration management service. Providing a nice user interface where you can change the configuration of your application on the fly. The use of feature flags is continuously gaining popularity within the software industry. Companies like to speed up their CI/CD pipelines using feature flags. Also to support A/B testing experiments and Canary releases.