Yet Another BASIC interpreter

 Yabasic is a traditional basic-interpreter. It comes with goto and
 various loops and allows one to define subroutines and libraries.
 It does simple graphics and printing. Yabasic can call out to libraries
 written in C and allows one to create standalone programs.
 Yabasic runs under Unix and Windows and has comprehensive documentation;
 it is small, simple, open-source and free.