There recently was a lot of hype about Corel 'WordPerfect Lightning' that is currently in beta. The program is a type of hybrid word processing application that you download and install on your local computer with online features that includes collaboration.
The program includes: word processing features, document viewer, and file organizer. It also includes a free online account with 200 MB storage for documents, and other information. For more information, check out this slideshow.
Note: The download is 20MB in size and requires user registration.