We previously presented ownCloud at the HKMUG meetings. ownCloud is free software which can be installed on any server. It basically consists of the same functionality as Dropbox plus added services like a calendar and contact server.
Now version 6.0 is out which includes Google Docs functionality. And, which is good news for Mac users, in contrast to ownCloud's statements that it doesn't support Mac Server, it actually does.
Join our January meeting to lear more!