Central Desktop - Team collaboration, task and project management software - Central Desktop
Wikia - Wikia
Coworking Wiki
WikiMatrix - Compare them all
Wikidot - Free Wiki Hosting
Swirrl: Online Database Software
Create a Wiki - Intodit.com
Universal Edit Button - Universal Edit Button
SlimWiki — Beautiful Wikis for Teams
Notion - an expressive and collaborative document editor
Rizzoma—wiki based collaboration service.
Knorbit
Huddle: The Enterprise Content Collaboration Platform
Your online project management software tools - Wrike
Lessons Learned Server
Confluence - Team Collaboration Software | Atlassian
Client Portal, File Sharing, Teamwork & Collaboration platform
TiddlyWiki — a non-linear personal web notebook
tiddlyspace - bring your thoughts to life
Padlet is the easiest way to create and collaborate in the world