Zephyr Basecamp is a functioning GTK frontend and PostgreSQL backend enterprise project that gives small and midsize businesses the same level of inventory, order entry, sales tracking, and accounting functionality as would be expected from commercial applications. It has interfaces for both X11/GNOME/Linux and Windows.
jGRASP integrates the Control Structure Diagram (CSD) seamlessly and unobtrusively into source-code editing for Java, C, C++, Objective-C, Ada, and VHDL. The CSD is a control flow and data structure diagram that fits into the space normally taken by indentation in source code. Its intention is to improve the readability of source code. The CSD also enables source code folding in a meaningful way, based on code structures. jGRASP provides lots of editing features, an integrated Java debugger, UML dependency diagrams for Java, configurable colors and font size, and click-to-error for compile and runtime (Java stack dumps) errors.
LinXtris is a simple Tetris clone. Although the name is inspired on Linux, the game is designed to run on any platform that supports the Gnat Ada compiler, the Gtk+ toolkit and the GtkAda binding. This game should compile easily on any *nix and Windows system since GtkAda using Gnat does not require a makefile for each specific platform.
GPS is a free software multi-platform and multi-language integrated development environment (IDE). It provides a wide range of tools integrated together, and features particularly powerful source navigation capabilities. GPS also integrates GVD, the GNU Visual Debugger, and replaces it.