Portable Ultima Patches
Jason “Xarton Dragon” Penney has released a set of portable, delta-only patches for the first six Ultima games (the GOG versions and, presumably, other installations as well).
Pix’s Ultima Patcher
Pix has produced a patching utility that will automatically update Ultimas 1-4 (the Good Old Games versions) with all available patches and enhancements for each title.