Microsoft created GW-BASIC version 3.23 in 1987 and that was the last official, commercial one. It is unsurprisingly unsupported, but still under copyright so it can't be sold or distributed without ...

PC-BASIC is a free, cross-platform interpreter for GW-BASIC, Advanced BASIC (BASICA), PCjr Cartridge Basic and Tandy 1000 GWBASIC. It interprets these BASIC dialects with a high degree of accuracy, ...