From OpenBRR

Pages and Editing

Text Effects

Emoticons

Tables

Quoting

Syntax highlighter

Footnotes

Polls and Votes

Spreadsheet calculations

Charts and Graphs

WikiWhiteboard

Lists

Hyperlinking

CamelCase Links

WYSIWYG

Web based presentations

Hierarchical Pages

Page Preview

Page History

Document renaming

Files

File Attachements

Embedded Video

Embedded Flash

Image Gallery

Attached Files Searching

Administration and Security

Page locking

Page access control

Backups

Spam prevention

Access Control Lists

User permissions

Member Features

User notifications

Subscriptions

Emailing

Wiki Search

Interface Features

Templates

Skins

User Customizeble Display

Other Wiki Features

Printable version

Wiki Statistics

Atom Feeds

RSS Feeds

Help system

Mindmap

Compatibility with portable devices