I've gotten pretty far using FOSS tools when it comes to making games, but I would like something like Substance Painter so I can fully dabble into 3D.
Nothing AAA quality or very professional, I just want something that works good enough for my indie games lol.
Never tried these but: https://armorpaint.org/ // https://github.com/armory3d/armortools
edit: Seems like Blender is capable of this too: https://www.youtube.com/watch?v=AnRQhH3fEDY