OpenOffice 3 enters beta stage The first beta-test version of the OpenOffice.org 3.0 productivity suite was released on Wednesday, adding significant features such as improved Mac OS X support and support for the OpenDocument 1.2 standard. (Read more) gtkmm gtkmm is the official C++ interface for the popular GUI library GTK+. Highlights include typesafe callbacks, and a comprehensive set of widgets that are easily extensible via inheritance. You can create user interfaces either in code or with the Glade User Interface designer, using libglademm.