There are many ways to obtain OpenClass, please select the one which suits you the best.
Source code
OpenClass source code is available on github.
Mandriva
If you are running Mandriva 2011/cooker distribution, it is available in contrib repository, and can be installed with urpmi openclass.
If you are running Mandriva 2010.1, 2010.2 or 2010.0, it is available in backports repository.
Ubuntu
If you are running Ubuntu 11.04 (Natty), it is available in ppa:eugeni/openclass repository.
Microsoft Windows
If you are running Microsoft Windows, click here to download the version 0.3.1 (previous versions: 0.3 0.2).