Here is a list of Wikipedia entries which describe the feature-set which should be ultimately covered by the Tiki Suite.

Tiki

Current

• Content management system (CMS) / Web portal
• Wiki engine / Enterprise wiki / Semantic wiki / Application Wiki
• Online Office Suite / Spreadsheet / S5Slideshow
• Groupware
• Web application (browser based)
• Internet forum (message board)
• Issue tracking system / Bug Tracker / Form generator
• Help desk
• Knowledge base
• Geospatial Content Management System (GeoCMS)
• Social Software / Enterprise social software
• Blog
• Personal information manager
• End user programming / Situational application
• Document management system (DMS)

Eventually in Tiki

• Customer relationship management (CRM) / Membership software
• Learning management system (LMS)
• Human resource management system (HRMS)
• Decision support system
• Enterprise resource planning (ERP)
• Electronic Document and Records Management System (EDRMS)
• Project management software We already can already a lot of with wiki and trackers but we need Gantt charts.

To be covered by other apps than Tiki

Mostly because it doesn't make sense to do in PHP/MySQL or because it's very specific and easy to integrate

• Unified communications
• Voice over IP
• Instant messaging
• XMPP (Jabber)
• Unified Network Platform
• mail server
• Web analytics
• Web conferencing
• Web-based VoIP
• Screen sharing
• Whiteboard
• Videoconferencing
• Video management software
• Password manager