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OpenUO is an Opensource community for the development of Ultima Online emulators, primarily focusing on Ultima Offline eXperiment 3, an OpenSource UO emulator allowing for single or online/LAN play of your own shard.
You can download file releases of UO's OpenSource Community project from List of release files
System RequirementsOperating System: All 32-bit MS Windows (95/98/NT/2000/XP), POSIX (Linux,BSD,Solaris etc..), Linux, Windows NT/2000, Windows Vista, Windows XP
List of release files