MESSUI is a unoffical builds of MESS with NEWUI. MESS is an open source project which documents the hardware for a wide variety of (mostly vintage) computers, video game consoles, and calculators through software emulation, as MAME does for arcade games. As a nice side effect to this documentation, MESS allows software and games for these hardware platforms to be run on modern PCs.
http://messui.1emulation.com
http://messui.1emulation.com