Gelide is a configurable multi emulator and multi system front-end that lets you manage any kind of emulated system (PC, console, arcade, etc.). Gelide lets you catalog and launch any game from any existing emulator under GNU/Linux. You can configure any emulator with command line parameters support.
Gambatte is an accuracy-focused, cross-platform Game Boy and Game Boy Color emulator. It is based on hundreds of corner case hardware tests, as well as previous documentation and reverse engineering efforts. The core emulation code is contained in a separate library back-end (libgambatte) written in pure platform-independent C++. There is a GUI that uses Trolltech's Qt4 toolkit (gambatte_qt), and a simple command-line SDL front-end (gambatte_sdl). The GUI front-end contains platform-specific extensions for video, sound, and timers.
c64img is a PHP script that converts an image (JPEG, PNG, or GIF) to an image that can be shown on a Commodore 64 (FLI style). It searches for the best possible colors in the 160x200 (X-doubled) resolution, and uses a simple dithering method to distribute errors. It outputs a 640x200 image consisting of the resampled original on the left and the dithered C64 image on the right.