A few that I'm tracking are:Flax https://flaxengine.com/
Stride https://www.stride3d.net/
and primarily learning Unreal so I can convert a few canceled Unity projects going forward...
stride looks pretty good, might try it sometime soon
I have made 6 Unity projects for game jams so far so this time I will be trying to make a game using just HTML, CSS, JS and a few other frameworks.
A friend of mine jumped ship to Godot and wants to learn it, but since I already know it (and they want to team up) we're playing with GB Studio instead for funsies. Love2D because GBS is too damn quirky for either of our tastes.
Panda3D https://www.panda3d.org/
im trying scratch as a challenge lol
