GFA-BASIC

Originally GFA-Basic had been developed for the ATARI console and the version for Windows wanted to be a valid alternative to VisualBasic. The goal was to give the programmer the best instruments to create powerful programs. GFA-Basic had never followed the road traced by VisualBasic, as it has always been developed as a product with its own characteristics. GFA-Basic is a professional programming language, it has hundreds of commands and functions and a very well written manual. Thousands of programmers use GFA-Basic but if you plan to start using it, keep in mind that this language does not follow those implicit syntax rules that most of the popular modern Basic languages do. Althought there are really many GFA-Basic programmers, unfortunately the forums I found where not enought populated to be useful. The IDE should be improved.
GFA-Basic has been discontinued at least since 2005.

Windows