GDStudio is a custom version of Godot that attempts to improve the editor... and damn does it succeed!  This isn't really a traditional fork, in that it focuses only on the editor and should be entirely compatible with existing Godot projects.   So what does it improve?  Faster asset loading and startup, vastly improved UI, the ability to open multiple scenes at once and more.   Honestly once you use GDStudio for a few days, going back to the Godot editor isn't easy.  It aint all rainbows and sunshine though as sadly the project is not possible to merge into Godot main branch and isn't currently open source.

*GFS Link* - https://gamefromscratch.com/gdstudio-a-better-godot-editor/
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Gamefromscratch

GDStudio is a closed-source, alternative front-end editor for the Godot game engine that redesigns the UI with significant usability improvements. Key features include a multi-pane tab system allowing multiple scenes, scripts, and resources to be open simultaneously with their own inspector and node trees, faster load times (roughly 2x compared to stock Godot 4.6), floating panels, and full-screen workspace tabs for shaders and resources. It is compatible with Godot 4.6.3 and 4.7 projects and ships with C# support. The main downsides are that it is not open source, currently only available for Windows, and still in alpha with incomplete add-on support.

GDStudio -- A Better Godot?