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.
PureExtreme is a easy to handle framework for purebasic (4.2x). It is designed for developing professional software. Each functions of the framework are optimized for speed and avoiding of memory overhead to the best of available knowledge.