Hi, i have found that website, they provide a growing amount of 3D models for free.
https://thebasemesh.com/These models are not textured. Only the meshes.
But i found this interesting, because it inspires me to make textures.
Hope you find this ressource useful too.
For example this is the guitar. It was fun to make the diffuse map.
76% of original size (was 660x19) - Click to enlarge