freebasic
One of the (if not the) most stable open-source BASICs in activity as of 2023, FreeBASIC is a large, modern and multi-platform compiler which started mostly influenced by Microsoft QuickBASIC but, as time passed, adopted some influences from C++ to the point it had to work with separate "language modes" — one for QB compatibility and one of its own, which is the one considered for the Keywords Reference section of this site.
lang -qb
mode