ownCloud is a free and opensource file sync and share app which is self hosted.

EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries, e…

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

Wondershare MobileGo is a super mobile toolbox which can help manage both Android and iOS mobile devices effectively and with ease.

Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.

SugarCRM is a customer relationship management (CRM) system.

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

Freshsales is a full-fledged Sales CRM software for Business.