From Sega Retro
MEKA is primarily a Sega Master System emulator, though it also emulates SG-1000, SC-3000 Sega Super Control Station (SF-7000), Sega Mark III, Sega Game Gear, ColecoVision, and Othello Multivision. It has support for zipped ROM files, can save screenshots in PNG format, and create save states for Master System and Game Gear.
MEKA includes a full-featured debugger and various hacking and auditing tools, allowing it to be used as a powerful platform for programming or reverse engineering software on the supported systems.
Version 0.70 was released on April 3, 2005 under an Open Source license. Since then there has been three official releases: 0.71 on 25 June 2005, 0.72 on 17 July 2007, and 0.73 on 30 May 2010, as well as a number of WIP releases in between which have added features such as 16- and 32-bit color support.
MEKA is dedicated to Wonder Boy III: The Dragon's Trap, wherein the first dragon is named Meka (or Mecha).