freebasic/fbc
FreeBASIC is a completely free, open-source, multi-platform BASIC compiler, with syntax similar to MS-QuickBASIC, that adds new features such as pointers, object orientation, unsigned data types, inline assembly, and many others.
License & maintenance
No license stated: by default nobody may reuse the code. Ask the authors before using it in a product.
Last code push 6 months ago.