I know it was a dead link but does this now mean the wiki is dead all together?
EDIT: noticed using wrong version of site as hit enter.
The wiki is not gone forever. They have stated that it is being refreshed as the original one was quite deprecated.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.