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Genesis Plus is a Sega Genesis emulator written by Charles MacDonald. The emulator emulates all sound channels, and has support for six button genesis gamepads, and support for both BIN and SMD format ROM images.
PGen is an Open source Sega Genesis emulator written in C++ programming language for Playstation 2. It uses GENS source code
Segagen is a Sega Genesis emulator for the Sega Dreamcast. It was created by hackers who ripped the software off of Sega's Sega Smash Pack. While being thought of as the most capable Genesis emulator for the Dreamcast, it's use is thought to be illegal in some countries, and is used by burning a disc with downloaded software.
It is much like the Bleem!cast beta in the sense that its use is frowned upon in the Dreamcast emulation scene. Several releases have been made, including the Echelon, Lemec, and Obsidian versions, all using the same core software.
Just like the Sega Smash Pack, this emulator was also critisized on its sound, because of the poor sound emulation.