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.
UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
Zoho CRM - Omnichannel CRM for Businesses of all sizes
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.
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.