mtPaint is a simple GTK+1/2 painting program designed for creating icons and pixel-based artwork. It can edit indexed palette or 24 bit RGB images and offers basic painting and palette manipulation tools. Its main file format is PNG, although it can also handle JPEG, GIF, TIFF, BMP, TGA, XPM, and XBM files.
GMAMEUI is a front-end for MAME on Linux. It helps the user play and configure arcade games more easily. GMAMEUI is an enhancement of GXMame, fixing a number of long-standing bugs, including adding support for SDLMame in preference over the now-obsolete X-MAME. New UI features were also added.