Not that I know of. Sophisticated AJAX based, web-based applications are relative newcomers on the scene (AJAX - Java and XML) hence most are are in alpha, beta or early versions.
That said, perhaps you may consider a network install of OpenOffice or of Star Office. Both will install to a server, the server having the bulk of the application and with a small "front-end" on the client machines (like 20M or so) handling the GUI. I did this quite a while ago with OO.org v1 on a Windows install, installing from the CLI. You'd have to do a bit of research on the details.