Netcipia

Netcipia is a available on internet, free, for public and private usage. Each "netcipia place" created can store a nominally unlimited amount of data, any number of places can be created, and Netcipia allows to invite any number of users to each place.

The main caracteristics are:
 * Wiki and WYSIWYG editor
 * Upload files up to 10 MB each
 * Version control
 * Spaces
 * 
 *  feeds
 * Customizable layout
 * Comments
 * Tags and tag clouds
 * Site maps
 * Panels management
 * SSL

See the Netcipia's features list for more details.