Lazarus it's an open source GUI RAD for Freepascal.
"Free Pascal (FPC) is an open-source Pascal compiler with two notable features: a high degree of Delphi compatibility and availability on a variety of platforms, including Windows, Mac OS X, and Linux. "
Links:
http://www.lazarus.freepascal.org/
In this links are daily snapshots:
http://www.hu.freepascal.org/lazarus/
