Written by Nick Gammon, G-Pascal v3.1 (Also v3.0 in archive) is a Pascal compiler/editor.  Included in the archive are many sample programs.

See http://www.gammon.com.au/GPascal/ for more details and even the source code for the compiler. Here is another site with even more G-Pascal info - http://www.supercoders.com.au/blog/nickgammongpascal.shtml