Wiki

Socialtext is a collaboration platform that allows everyone to work on the same page. It allows users to edit within a simple WYSIWYG interface and you can also preview while editing and comment on any page. Socialtext provides both a hosted service and a hardware / software appliance for installation. Deployment options are designed for range of organizational needs: Enterprise, Professional, Personal and Open Source. The basic account is free

Confluence is an enterprise wiki that provides: Enterprise security, Simple installation and management, Attractive, user-friendly WYSIWYG interface, Powerful tools for structuring and searching your wiki, Professional features such as PDF export and automated refactoring, An open API for extension and integration

PBWorks is perfect for small businesses and small teams/groups in larger companies looking for an easy, secure way to collaborate at work. Plus, you can make and use a PBwiki as easy as a peanut butter sandwich – no IT required, but if your IT department needs reassurance, see our IT White paper. Contains real-time collaboration and communication tools.

Finally, a Wiki that is as easy to use as a word processor. It's a Wiki + WYSIWYG Editor + Fine Grained Access Control. Create Groups. Add, edit and share contents among your group

Google Sites (from Google Apps) makes creating a team site as easy as editing a document. Use Google Sites to centralize all types of information - from videos to presentations - and share your site with just a few people, your entire organization, or the world.

MindTouch Deki is an open source collaboration and integration platform. Share information and files more efficiently, wiki-style, with the most sophisticated and popular enterprise wiki available. Collaborate smarter immediately. Connect and mash-up enterprise systems, online services, and Web 2.0 applications today.

Edit pages in the browser. Document management. Search across and inside. Engage your colleagues. Users access control

Enterprise-strength wiki solution that combines the best of wikis and blogs to effectively support, streamline, and manage collaborative team efforts. Provides environment for teams to work together more effectively, making collaboration, communication, and sharing knowledge across project and geographies easier than ever.

Writeboard is a web-based editor that enables you to write online documents and collaborate with colleagues. You can subscribe to documents via RSS to be notified of changes and keep your writings organized with Backpack integration. Writeboard requires Internet Explorer 6.x, Safari, or Firefox and it is free to use.

StikiPad is a hosted wiki solution that gives you an easy way to organize your information and share information with others. We run completely in your browser with no downloads and easy administration, letting you take your StikiPad wherever you have access to the Internet. But don't be fooled by the word easy - it's only as easy as you want, and as powerful as you want it to be. StikiPad is like a blank piece of paper - you decide what you're going to make of it.