Among the major goals of this series is a port to GTK, better text support and a multi document interface. Apart from the sources of Sketch, you need some additional software. See the download page for details on what software and where you can get it. For Sketch to work properly with transformed text, you also need an X-server capable of scaling and transforming fonts. I'd also like to hear from you if you want to contribute to Sketch.
Help is always welcome.
Furthermore, there's a mailing list for all Sketch-related topics. New versions are announced on the mailing list, on the SourceForge Sketch page and on freshmeat . Some of the code distributed with Sketch is not directly part of Sketch and is distributed under a Python-style license.