ttMaps is based on several Open Source libraries, published under various licenses (LGPL, MIT, public domain, ...)
Here is the list, and the source code used.
GCC compiler
The compiler used is the GNU compiler gcc 3.3.4 modified by TomTom.
It has been patched to allow the use of RGB16_565 mode. The patch
was provided by David Hill. Read this message
from the mailing list of the project Cairo.