Google calendar, iCloud etc exist. but who wants to spend so much effort gifting google with free information about all their friends? Well, most of my friends, TBH. But it leaves me feeling gross.
Jargon to know here:
are the de facto standards to sync your calendar and contact information,
All you need is a server which talks those standards and
you can use whatever client you'd like.
So! Running your own. that's a legitimate use of your precious free time, right? Uh.
Apple's open-source Calendar Server. (Does contacts too)
OSX/Windows/Linux: Radicale seems to be much easier than the Apple thingy.
Radicale is a small but powerful CalDAV (calendars, todo-lists) and CardDAV (contacts) server, that:
Shares calendars through CalDAV, WebDAV and HTTP.
Shares contacts through CardDAV, WebDAV and HTTP.
Supports events, todos, journal entries and business cards.
Works out-of-the-box, no installation nor configuration required.[…]
Is GPLv3-licensed free software.
Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.
DavMail also supports the CardDav protocol to sync address books. This new feature is sponsored by French Defense / DGA through project Trustedbird.[…]
DavMail gateway is implemented in java and should run on any platform. Releases are tested on Windows, Linux (Ubuntu) and Mac OSX. Tested successfully with the Iphone (gateway running on a server).
With iRedMail, you can deploy an OPEN SOURCE, FULLY FLEDGED, FULL-FEATURED mail server in several minutes, for free.
We did the heavy lifting of putting all the open source components together and applying best practices. Our product does all the major tasks for you. Furthermore we offer professional support to back you up in case you have some problems.[…] Manage your calendars (CalDAV), address books (CardDAV), tasks on a easy to use web UI or your mobile devices (iOS, Android, BlackBerry 10, Windows Phone).
- CalDAV, CardDAV and ActiveSync are offered by SOGo Groupware.