Evercontact - Your contacts always up to date and automatically with Evercontact.

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

CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.

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

Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses

HelpScout - Help Scout is a simple, straightforward way to provide excellent support