GEL is a collection of embedded libraries and examples for 68HC11 and 68HC12. Several libraries are general purpose libraries that are or may be ported on various boards. Some libraries are more specific due to the hardware they control.
GEL also contains several examples indended to show how to use the GNU development chain for 68HC11 and 68HC12.
GEL is based arround a small framework intended to help to use the libraries, its examples, build them, port them to new boards and provide documentation. They come with a framework to build them. This framework consists of:
http://gel.sourceforge.net/download.php