Build system and integration libraries allows automatic building of GTK+-2 & 3 applications on OSX using the native Quartz display system, the Mac menubar, and familiar key bindings.
This project is now part of Gnome, see https://wiki.gnome.org/action/show/Projects/GTK+/OSX for more information.
xbgtk - an xbase/Harbour/xHarbour object-oriented wrapper for using the GTK+ GUI. This project has been deprecated in favour of https://github.com/tuffnatty/hbgi, an approach that uses GObject Introspection for automatic bindings.
Expandy allows full control of the Gnome desktop environment through a single button interface. This gives people with physical disabilities access to a computing environment by emulating keyboard and mouse events using a button and on-screen feedback.
GStreamer is a streaming-media framework, based on graphs of filters which operate on media data. Applications using this library can do anything from real-time sound processing to playing videos, and just about anything else media-related. Project i
Gscope is a software oscilloscope library build using the GTK and GNOME toolkits. Gscope can be used to monitor, display and debug various types of "real-time" data. Additionally, the scope can be used for graphing file data that is in a tuple format.