Open-source, free, multi-platform BASIC compiler, with syntax
similar MS-QuickBASIC (including the GFX statements), that adds
new features such as pointers, unsigned data types, inline
assembly, a pre-processor and many others.

The complete FreeBASIC manual is included with the package. You can
view it at:

file:///usr/doc/FreeBASIC-1.07.1/html/index.html