The regular sourceforge download page for OpenWFE is a bit crowded.
There are other ways to get OpenWFE software.
Here are the direct links to some specific OpenWFE downloads :
The OpenWFE standalone suite, in Java.
Lukas Eder's Eclipse RCP business process designer for OpenWFE
The source is at http://svn.sourceforge.net/viewvc/openwfe/trunk/openwfe-ide/.
(no release for this package, but the source is available at http://svn.sourceforge.net/viewvc/openwfe/trunk/openwfe-php/)
