Thanks for asking @Ateria, I also have interest in Game Editors, and inspired by @Dad72.
Hello again David. 
I also vote interest for your editor.
The thing about game editors:
They are highly subjective to what your are building.
Finding a one-editor-fits-all is a big challenge.
Not only to MAKE… but also to LEARN how to USE!
Check out BLENDER for example… the thing is massive.
There is terrain editing, ribbon editing, path editing, materials, bones, textures, etc.
It goes forever.
So, in light of that challenge - developed a different strategy:
find tool or customize a tool for exactly what you need - and compile over time.
Put in a namespace pattern in your code - they are always there!
Then, behind GAME_MODE, put an EDIT-MODE
each time you use a tool - you might end up creating a new tool?
It happens. A good example is conversions from local_coordinate to world_coordinate - or origin pivot, etc.
If it is always different, maybe get good at building custom tools?
idk.
There are many editors in BabylonJS now… and all are great!
I think @satguru made a nice one… (dont have link) (maybe Gizmo now) ( extended it last year )
and @nasimiasl has a [Geometry Editor]( GeometryBuilder ).
found the vids - hit that LIKE!
Gizmos look really awesome (but I havent used yet):
https://doc.babylonjs.com/how_to/gizmo
https://doc.babylonjs.com/api/classes/babylon.gizmomanager
And there are many variations underneath… (many). 
Example: yesterday, I customized a PATH~EDITOR into a Ten-Key-Controller, for keyboard editing (like vim in 3D). Tada!
Because - Ten-Key makes a good precision-control for CAMERA during EDITs.
AND - as a holder to playback (edit) many different ANIMATION-SEQUENCES.
Ten-Key-CTRL has 3 modes now. And seeing many more options… like CURVE EDITING (someday). Intense. 
Hop on over… check it out!
If you need CLASSICAL or TYPESCRIPT - refactor it and it is yours!
I VANILLA so much.
Overall, good to see so many EDITORS.
Maybe after you customize your specific tools - shareback to community?
~Secret-sauce…
