OpenGoo

OpenGoo bundles tools to edit text and HTML documents and presentations. A module to handle spreadsheets is currently under development. You can upload files in other formats to OpenGoo for centralized access and version control. Users can also create and manage task lists, send and receive email, and manage personal and group calendars, links, and contacts.

Many of these tasks are handled by other open source apps. Instead of reinventing the wheel, the OpenGoo developers glue together available tools, filling in the odd hole with custom apps wherever required. Some of the tools they use include FCKEditor for text editing, ExtJS for most of the AJAX interface, activeCollab for project management, and Reece calendar. For handling and editing presentations, the developers created something called Slimey.

Get OpenGoo here: http://opengoo.org/