Gamekins appeared in the October Mac-app community thread as a free, MIT-licensed game launcher. Its author describes one library for supported Epic, Steam, GOG and local games, plus collections, friends and play-time tracking. The public GitHub repository is real and available to inspect.
This is a curiosity rather than a mature replacement for official stores. The author says Steam and GOG installs still rely on their own clients, and cloud saves and achievements are not implemented. That makes it a low-stakes test for a spare Mac, not something to entrust with a carefully configured library.
If the Mac gaming setup is scattered, compare the unified library against the built-in Epic and Steam clients. As a developer, the more interesting angle may be the project’s Electron and TypeScript architecture and how it manages third-party game metadata.
What to do: Inspect the GitHub README and releases before trying this early 0.1 build.