Information in the game database is updated periodically. Below, you'll find that information compiled as pertains to M2. The company may be involved as a publisher, developer or both.
3D Sonic the Hedgehog [December 5, 2013]
Digi Charat: Digi Communication [October 25, 2002]
Digi Communication 2 in 1 Datou! Black Gemagema Dan [July 15, 2004]
One Piece: Dragon Dream [April 28, 2005]
Gunstar Heroes [March 24, 1995]
Gauntlet IV [September 16, 1993]
SEGA Vintage Collection: Alex Kidd & Co. [May 23, 2012]
There are numerous companies in the industry, and their names change like the weather. The information above is not particular about the finer details. Acquisitions are common, so companies with no recent listings may still be developing games under a new name. For example, DMA Design currently has a Rockstar name. Do you know of a title that is not listed above but should be? Be sure and let a staff member know. You can contact staff if you click here.