Wikipedia
ZBasic was a compiler first released by Simutek ( Tucson, AZ) in 1980. The combined efforts of Andrew Gariepy, Scott Terry, David Overton, Greg Branche, and Halbert Laing lead to versions for MS-DOS, Apple II, Macintosh, CP/M and TRS-80 computers. ZBasic was a very fast, efficient and quite advanced BASIC compiler with an integrated development environment. It aimed to be used as a cross-platform development system, where the same source code could be compiled to different platforms without any modifications.
ZBasic featured device independent graphics: the same compiled code could work on different display resolutions and colors, and even in text mode. Original PC versions included graphical support up to EGA for MS-DOS.
A special feature of ZBasic was BCD (binary coded decimal) math with accuracy up to 54 digits. Another special feature was INDEX$ array, an array of variable length strings that could be easily sorted, searched etc.
In 1991, Harry Gish and 32 Bit Software Inc. (Dallas, TX) purchased the MS-DOS version. Nando Favaro expanded it to include 16 and 32 bit specific machine code as well as VGA and VESA video. Zedcor concentrated on the Apple Mac market and renamed it FutureBASIC.