way back when, a large amount of AOL stuff was written in tcl. AOLServer was one, and they actually opened sourced it - https://github.com/aolserver/aolserver
And lest you think that AOLserver is dead based on the lack of new activity on that github repo (which is just a mirror, BTW), Naviserver - https://bitbucket.org/naviserver/naviserver - which was forked from AOLserver some time ago, just released a new version yesterday.
