I recently learned about "MiniACS".
http://miniacs.sourceforge.net/ It was developed by zjednoczenie.com for use on the sites that they build. More info at
http://miniacs.zjednoczenie.com/snapshot.htmlIt needs a customized AOLserver that Tomasz Kosiak announced to the mailing list a few days ago - see the "AOLserver Improvement Proposal" thread. (Mostly vserver-related stuff.)
I haven't used it and Tomasz has told me that they don't have the resources to support it.
