Enterprise software for OS X Server

Hello! I am researching Enterprise software options that are open source and operate on OS X. Does anyone have experiences they can share? My main interests are user friendliness, rich features, and MySQL for database. Here are a few I have been reading about lately: http://www.gnuenterprise.org/ http://www.ossuite.org/ http://www.compiere.org/http://www.compiere.org/ Thanks!