Free Pascal

Dev-Pascal
A full-featured integrated development environment (IDE), which is able to create Windows or console-based Pascal programs using the Free Pascal compiler.
http://www.bloodshed.net/devpascal.html

FPC-Lazarus Project
The class libraries and development environment for Free Pascal that emulate Delphi.
http://www.lazarus.freepascal.org/

Free Pascal Compiler Web Ring
List of websites related to Free Pascal compiler and programming.
http://o.webring.com/hub?ring=freepascal

Free Pascal Meets SDL
Tutorial to configure MS Windows to work with SDL (Simple DirectMedia Layer) library under Free Pascal. SDL was first done in C/C++, but headers were translated to pascal units, so library is usable for Pascal.
http://userpage.fu-berlin.de/~molski/fpsdl/

GTK+ for Free Pascal
Official FreePascal GTK+ translation
http://www.freepascal.org/packages/gtk.html

Open Source Pascal Compiler Project, Macintosh Version
An open-source Pascal Compiler project in hopes to establish a freeware Pascal compiler for the Macintosh platform.
http://www.pascal-central.com/osp/