JSPWiki MediaWiki Confluence JotSpot XWiki
support multiple wikis (or equivalent paradigm)
WYSIWYG editing plugin
page history
LDAP authentication
export into at least one of: XML, PDF, DOC, plugin
email notification plugin
fine-grained access control (private, editor, reader for wikis and pages) plugin
users can grant and revoke access to their wiki in a per-wiki administrator role
system-wide skinning/themeing
create page
delete page ?
page diff
Wiki Markup attach file
delete file ?
file versioning ? ?
ability to use SAMIS API for automatic group creation
add user to a group wiki
remove user from a group wiki
make user group wiki admin