From OpenWiki to ScrewTurn Wiki
Since 2002 I have used OpenWiki as a means of collecting, sharing and communicating information with development team members and stakeholders. It was fast, reliable and had some surprising features. I never really found an alternative that "felt right" to me.
But I've now moved on to ScrewTurn Wiki (free - GPL). Has just that right combination of performance, features and simplicity!