The project manager you've waited for.
Hourglass is a third-party project manager for Godot Engine, the free and open-source game engine. It keeps track of all your projects, but also the engine versions they use—all installed in parallel through one simple interface.
Every version of Godot Engine, going back to 3.0, is just a click away.
Custom Engine Builds
Hourglass supports custom engine builds. Just add a new Custom Version and point Hourglass to your executable file.