In debian, add the following to /etc/apt/sources.list:

deb http://debs.webslinger.org unstable/
Then run apt-get install webslinger.

If you wish to run webslinger inside ofbiz, then install webslinger-container-ofbiz.

To browse the source code, visit here. If you wish to check webslinger out, the urls needed are:

svn co svn://svn.webslinger.org/code/trunk webslinger
svn co svn://svn.webslinger.org/website/trunk website