SpyUO is a network packet analyzer for the Ultima Online protocol. It captures and decodes packets between the UO client and server, displaying them in a human-readable format. Invaluable for server emulator developers debugging protocol issues, implementing new packet handlers, or reverse-engineering client behavior. The archive includes SpyUO version 1.10 with both 32-bit and 64-bit zlib support, plus the version 1.03 source code.

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Archived from the UO FreeShard Community Tool Box (archive.org, 2019).