A tool that takes a directory of images including subdirectories, converts them to .mip and puts them into a texture wad. It shall rename filenames that are incompatible with Quake and keep track of those renamings (so the source images can be used as replacement textures for the ones in the wad, a simple log is enough). Support at least TGA as source format. Windows is alright, cross-platform would get you a little extra:
25 $ would have went to Baker, but he proposed a new bounty instead. Thanks! You can find the tool here