Mac users interested in Openemu for mac 10.5.8 generally download:
Work with a toolset for emulating classic console games on modern Mac machines. Check out various settings for optimizing performance and customizing controls. Add, browse, organize, and select individual titles, create custom profiles for running them, etc.
An emulator for legacy computer systems
OpenEmulator aims is an easy to use, accurate, portable emulator of legacy computer systems.
By using a software components framework, it is easy to expand a software emulation with additional software devices, just as a real system could be expanded with real devices.
MAME OS X is the Mac OS X port of the multi-arcade machine emulator (MAME). It is an emulator that can play lots and lots of old arcade game ROMs. There are some current games that can also be emulated. Although the port for Mac OS X isn't as regularly updated as the Windows counterpart, there is still some fun to be had with it. The last update was in late 2009.