>>312433617
blender is a free program, cats is a plugin within that program that makes it easier to do simple avatar upload stuff, tuppers outdated megatutorial will teach you the basics of avatar uploading with cats and after that all you have to do is use unity (make sure you use the right version of it) to upload it to vrchat (all of this is in the megatutorial but outdated slightly)
https://youtu.be/7P0ljQ6hU0A