Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit and the GNOME desktop environment. The user interfaces designed in Glade are saved as XML, and by using the GtkBuilder GTK+ object these can be loaded by applications dynamically as needed. By using GtkBuilder, Glade XML files can be used in numerous programming languages including C, C++, C#, Vala, Java, Perl, Python,and others.

The GNU Pascal Compiler (GPC) is, as the name says, the Pascal compiler of the GNU family

Granite Data Services (GDS) is a free, open source (LGPL'd), alternative to Adobe® LiveCycle® (Flex™ 2+) Data Services for J2EE application servers. The primary goal of this project is to provide a framework for Flex 2+/EJB3/Seam/Spring/Guice/Pojo application development with full AMF3/RemoteObject benefits. It also features a Comet-like data push implemention (AMF3 requests sent over HTTP) and ActionScript3 code generation tools (Ant task and Eclipse builder).

Diff Merge Tool and Folder Compare application with a Java API library. Available for Windows, Linux, MacOS X, and Unix.

Complete command line interface included for integration with other tools such as all the popular SCM products.

Advanced features include:
- Trustworthy 3-way auto merge
- Builtin support for over 150 file encoding/character set formats
- Inline difference highlighting
- Unicode file/folder names supported
- Compare reports can be saved at HTML

GUITAR is a suite of models, components, and tools for automated testing of software applications that have a Graphical User Interface (GUI) front-end.

GUnit is a C unit testing framework in the spirit of JUnit. The framework incorporates an easy to use GUI based on the GTK+ libraries.

H2 is a the Java SQL database. The main feature of H2 are:
* Very fast, open source, JDBC and ODBC API
* Embedded, server and cluster modes; in-memory databases
* Browser based Console application
* Small footprint: around 1 MB jar file size

HBase is the Hadoop database. Its an open-source, distributed, column-oriented store. HBase's goal is the hosting of very large tables -- billions of rows X millions of columns -- atop clusters of commodity hardware. Try it if your plans for a data store run to big.

This is a handy utility which monitors the status of Hudson (a Continuous Integration/Build engine) by parsing its RSS feed. hudsonTracker sits in your system tray, and displays notifications (and optionally plays sounds) when builds pass or fail.

HyperGraphDB is a general purpose, extensible, portable, distributed, embeddable, open-source data storage mechanism. It is a graph database designed specifically for artificial intelligence and semantic web projects, it can also be used as an embedded object-oriented database for projects of all sizes.