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Free Pascal Compiler FreePascal (aka FPK Pascal) is a 32 bit Pascal compiler with extensions for different processors and operating systems. It tries to stay compatible with the dialects of well known proprietary Pascal-based compilers, so you don't have to learn much to switch to free software and/or systems. The language syntax is semantically compatible with TP 7.0 as well as most versions of Delphi (classes, rtti, exceptions, ansistrings). FreePascal supports function overloading, operator overloading and other such features. It also comes with several command-line tools to help your programming, including a source formatter, a makefile generator, a C header translator, a unit dependency lister and even TP lex and yacc. FreePascal comes with its own development environment (not for all platforms yet).

GNU Pascal GNU Pascal is the Pascal language compiler of Project GNU. It is a 32/64 bit compiler that is linked against the GCC backend and will be integrated in to GCC in the long run. It runs on all operating systems compatible with GCC, and can act as a native or a cross compiler between those systems. It implements ISO Pascal, Borland Pascal 7.0, and parts of other Pascal standards or de-facto standards.

GTKpas GTKpas is based on the gtk.h header translations and external declarations included with FreePascal and builds an objective model around these functions. The package includes a binding for GtkGLArea, which lets users embed an OpenGL drawing area in a GTK window.

Pasdoc Pasdoc generates HTML and LaTeX documentation for Pascal units. It takes descriptions from comments within the source code. Object Pascal features up to Delphi 4 are supported.