In my district we're looking for recommendations for wiki software. We've used hosted solutions such as WikiSpaces, PBWiki, WetPaint, etc. We're looking for something that we will host with some of the same features such as these ease of use, attractive interface, education-friendly, etc. Free or for purchase.
1. Install and run on our server in district
2. WYSIWYG editing
3. Page history
4. Ties to LDAP or ActiveDirectory for single sign-on
Thanks in advance for any suggestions.