QBASIC became QuickBASIC, which was both an interpreter and a compiler, using the same visual editor as QBASIC. To this day, it still retails for $150. There was also the Professional Development System which contained the last version of QuickBASIC, 7.1, but Visual BASIC For MS-DOS quickly replaced that. A freeware successor was written a number of years later by an uninvolved party, which was called freeBASIC. A direct descendent was then written a few years after that, called QB64, again from uninvolved people. freeBASIC is a BASIC-like true compiler that has tons of C-like features, QB64 is essentially a modern QBASIC clone that aims to be able to run all QBASIC code unmodified. I actually use freeBASIC for some of my utility work... most of the binary data files for MSR are assembled using tools developed in freeBASIC. The map editor for MSR was written in Visual Basic 6 though.