I don't know how many people use this, but I still find it very useful for its native handling of some of the models formats that GZDoom supports. It's a good, simple-to-use, basic model editor that can edit and save MD3 models and animations directly, as well as several other formats.
https://clover.moe/2023/04/23/maverick-model-3d-1-3-14/
It's a minor update, but nice to see that it's still getting a bit of love.
For those who don't know, Maverick is a bugfix and continuation of Misfit Model 3D.