Pioneer
Pioneer is a feature flag management tool built to handle an organization’s migration from a monolithic architecture to a microservices architecture.
Pioneer is a self-hosted feature flag management tool, built entirely open-source. It leverages a React/Redux frontend with an Express backend and PostgreSQL DB for easy flag management, NATS JetStream for asynchronous, fault-tolerant messaging, and a NodeJS daemon for SSE distribution of data to custom built SDKs (available in Ruby, NodeJS, and Go).
You can read the full project write-up or peruse the usage documentation.