From Lazarus-ccr

The NBS Pascal Compiler was a two-pass Pascal language compiler for the PDP-11 series of computers. It was developed for the U.S. National Bureau of Standards (now the National Institutes of Science and Technology).

Various Pascal Compilers:

AAEC Pascal - Alice Pascal - Borland Pascal - Delphi - FPC - GNU Pascal - Kylix - NBS Pascal - OMSI Pascal - P32 - Swedish Pascal - Turbo Pascal - UCSD Pascal - VAX Pascal

An extensive list of compilers is maintained at Pascaland.