I like BlendSwap. As the name implies, it’s for Blender, but I had no problem using one of their first person rigs as a base for my first person game in Unreal. Getting rigged characters into Unreal is easy, as long as you don’t mix applications. Taking the mannequin from the sample content (which was in all likelihood created using Maya) and trying to edit it in another application like Blender is a pain in the ■■■. That’s where you get weirdness with the skeletons.