[ Java version ]
The information that you can find at sextantegis.com refers to SEXTANTE for QGIS. However, a Java version, which runs on applications such as gvSIG and OpenJUMP, is also available. The latest version is 1.0, and can be downloaded from its googlecode website.
Although the Java version was originally created and developed by the team behind the QGIS version (the same people that run this website), the gvSIG CE project is now responsible of mantaining it as part of gvSIG CE and they are actively improving it, with occasional contribution from us. Go to their website for more information, and to get the latest news about its development.