GNAT Programming Studio (GPS, formerly known as the GNAT Programming System) is a free multi-language integrated development environment (IDE) by AdaCore. GPS uses compilers from the GNU Compiler Collection, taking its name from GNAT, the GNU compiler for the Ada programming language.GPS is cross-platform, running on Linux, FreeBSD, Microsoft Windows, Mac OS X, and Solaris. GPS uses GTK+ as the widget toolkit for its graphical user interface.