I am looking for a free, fairly user-friendly alternative to Dropbox. Dropbox has a 2gb limit on their free account for syncing files. I don't need the online storage. I would like to be able to file sync directly between my pcs (Mac, WIndows XP, and Ubuntu) either through my home network or over the Internet. Something like Crashplan, which is for backup, but for file syncing. Does anyone have any ideas?
There is Ifolder, but that looks complicated to set up.