I haven't tried ownCloud yet, but from what I've read so far, it seems promising. It supports CardDAV [0]. The software is free, but you have to host it on yo

I haven't tried ownCloud yet, but from what I've read so far, it seems promising. It supports CardDAV [0]. The software is free, but you have to host it on your own server. There does appear to be some services that offer it as a service, and one service that has a free tier [1]. [0] http://owncloud.org/support/calendars/ http://owncloud.org/support/calendars/ [1] http://owncloud.org/providers/#free http://owncloud.org/providers/#free