GNU Embedded Libraries
Sources of GEL.

GNU Development Chain for 68HC11 and 68HC12.
The main site to obtain the GNU tools for 68HC11 and 68HC12. This site provides binaries of the compiler for GNU/Linux and Windows. Latest development and patches for the GNU HC11/HC12 Tool Chain is also available on that site. These tools are integrated in FSF sources (gcc, gdb, binutils) since July 2000.

GNU Compiler Collection
FSF Official distribution of gcc. It includes the 68HC11 and 68HC12 port.

GNU Debugger/Binutils and others
You'll find here the debugger GDB, the linker/assembler and other tools. They have been ported to 68HC11 and 68HC12.