Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Kin - Kin is money for the digital world. It is used to generate value through a shared, decentralized cryptocurrency in a digital ecosystem of apps and their users.

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

Flexibits - Makers of Cardhop, Chatology, and Fantastical.

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.