Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.
Zoho CRM - Omnichannel CRM for Businesses of all sizes
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
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.