Blender Secrets - Texture Ripper
Texture Ripper is part of the free app Shoebox, from the creator of the popular Tex Tools add-on for Blender. It works separately from Blender. It's very useful if you want to get flat, perspective-free textures from photographs.
Get a 60$ discount on my courses + book
Besides the above modeling course, I also made a Hard Surface Sculpting course, as well as a course about making drag and drop materials, like in Substance Painter, for use with mech models (though it also applies to other materials), no UV unwrapping needed.
To get all 3 courses + my 2000-page Blender Secrets book and accompanying videos with 60 dollar discount, you can buy them all as a bundle. The Complete Hard Suface Bundle.