Source code
Releases are available from the Download page.
GtkGLExt's git repository can be browsed on git gnome:
GtkGLExt is maintained and developed on a volunteer basis. Contributions to improve GtkGLExt are welcome.
Mailing list
The gtkglext-list is a low-volume list that discusses use and development of GtkGLExt.
Bug Reporting
Please report bugs using GNOME bugzilla.
IRC Channel
You can find us on the IRC channel #gtkglext on GIMPNet.