Microsoft Outlook is a personal information manager from Microsoft.

SugarCRM is a customer relationship management (CRM) system.

FullContact gives you all the power of your address book, right in your Gmail inbox.

Memotoo sync all your contacts from Gmail, Facebook, phone, Thunderbird, Outlook, etc in a single address book.

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

OwnDrive is easy to use free online storage service for businesses, professionals, and individuals to store, backup, collaborate and share files with others.

FastMail is an email service offering paid email accounts for individuals and organizations.

Google Contacts is Googles contact management tool that is available in its free email service Gmail.

fruux is a cross-platform synchronization service.

Funambol is a provider of platforms that power many cloud services.