QuickNES 1.1b3 (by Shay Green)
QuickNES is a Nintendo emulator, very promising !

The emulation is fluid.

Game Music Box 0.5.2b3 (by Shay Green)
Game Music Box plays video game music files.

Game Music Box 0.5.2b3 (by Shay Green)
Game Music Box plays video game music files.

Audio Overload 2.0b7 (by Richard Bannister)
Audio Overload is a video game music player for the Macintosh.

SMS Plus 1.2.2 (by Richard Bannister)
SMS Plus is a Sega Master System/Game Gear emulator for Mac OS X.

MacFC 0.7.6 (by T. Aoyama)
MacFC is a Nintendo Entertainment System emulator, allowing you to play the original Nintendo games on your Mac.

Crack Attack 1.1.3 (by Daniel Aarno)
Crack Attack! is an OpenGL game based on the Super Nintendo classic Tetris Attack.

RockNES 4.0.1 (by Richard Bannister)
RockNES is a Nintendo (NES) emulator that supports full PPU emulation, full sound emulation (including VRCVI sound, used by some Japanese games), battery backed RAM, Famicom DiskSystem, VS Unisystem, and some 70 different mappers.

Javagear Beta 4a (by Chris White)
JavaGear is an Open Source Sega Master System and Game Gear emulator written in Java.

iNES 1.2 (by Marat Fayzullin)
iNES is a Nintendo Entertainment System emulator for Mac.

Modeler 0.9.5 (by Richard Bannister)
Modeler is a Sega Arcade Emulator for Mac OS X.

Genesis Plus 1.2.8 (by Richard Bannister)
Genesis Plus features very accurate emulation of the original Sega Genesis, even to the point that some software which has problems on the real hardware (Sonic Crackers, for example) exhibits the same behaviour under emulation.

Epsilon Tahari 1.0.1 (by CodeBlender Software)
Epsilon Tahari: Reign of the Machines is a simulator/action style game where you have been sent on a mission to the planet Epsilon Tahari.

SimCity 4 Updater 1.0.2 (by Aspyr Media, Inc.)
The long-awaited 4th generation of the game SimCity™, SimCity™ 4, features new simulation and graphics engines, new regional game play and the new ability to track the lives of individual Sims as they go about their daily routine, SimCity 4 is the most realistic, powerful and personal SimCity experi

OIDS Expanding Galaxy I 1.0 (by Xavagus Prime Software)
Over forty-five Galaxies for OIDS and OIDS.

XV (15-Puzzle) 1.1 (by LBSoftware)
XV (15-Puzzle) is a classic puzzle game where the goal is to arrange the tiles in order from 1 to 15.

Super Bounce Out! 1.0.2 (by GameHouse, Inc.)
Super Bounce Out! is a game where you line up similiar balls in rows of three or more.