A Pascal compiler and dialect. The original TurboPascal fit an IDE and very fast native code compiler into 26 kilobytes. It was the nicest programming enviroment around for CP/M computers and the early MSDOS PCs. The Pascal dialect it implemented was a expressive as C, and safer.
(I kind of lost track of TurboPascal about here.)
See the Pascal entry for Linux compilers that will compile !TurboPascal code.
5 pages link to TurboPascal: