WeChat is a social media with instant messaging, commerce and payment services application.

fruux is a cross-platform synchronization service.

gSyncit is an Outlook cloud synchronizer.

CopyTrans Contacts gives you full control over your iPhone contacts. It's a fast and easy way to organize, edit back up and export iPhone contacts.

Baïkal is a Cal and CardDAV server, based on sabre/dav, that includes an administrative interface for easy management.

Soocial provides a synchronization service that syncs contacts between the users' computers, phones and web apps.

AkrutoSync helps you automatically sync Outlook across all devices.