fruux is a free service that keeps your contacts calendars and tasks synced across platforms and devices.

Share a calendar with your family create a team address book or publish your basketball team's schedule you have full control. Access and edit your contacts calendars and tasks from anywhere with any device and in any application. With the fruux web application you also have easy access to everything in the browser. fruux is made in Germany and your data is always securely backed up for you. We are laser-focused on playing nice with everything via open standards like CardDAV & CalDAV and will never lock you into a data silo.

To use this app you'll need a free fruux account:
https://fruux.com/account/register/

Features:
* Contact syncing
* Calendar syncing
* Task syncing
* Built-in task/todo-list application

Need help? https://twitter.com/fruux

Keep your contacts calendars and tasks synced across platforms and devices: fruux works on Apple Mac OS X Apple iOS (iPhone iPad & iPod Touch) Blackberry OS 10 Mozilla Firefox OS Microsoft Windows Google Android Linux with popular apps such as Microsoft Outlook Mozilla Thunderbird BusyCal and with many other platforms devices and applications. Check https://fruux.com/supported-devices/