Looking for an alternative to SharePoint (Microsoft’s enterprise collaboration tool)? Check out Clearspace, an enterprise collaboration solution much like SharePoint. It is not free, but offers a 30-day free trial, an instant "test-drive," and a free live demo for interested parties. From what I could see, it’s a lot more "Web 2.0"-ish looking than SharePoint, offers some additional functionality, and . I can’t speak to the issues of pricing or support, but their customer list sure is impressive: Dell, Intel, Electronic Arts, Netflix, Oracle, GE, etc.
found via eHub