I recently tried out Insightly's servise and I absolutely appreciate it! It's extremely intuitive and user-friendly, making it easy for me to keep track of all my customer relationships as well as manage projects. Plus, the pricing is very affordable compared to some of the other similiar to this project management systems out there - a total win! I highly recommend Insightly.
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
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
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Copper - Copper (formerly ProsperWorks) is easy-to-use customer relationship management for small businesses. Capture contacts and sales leads direct from Gmail with our simple CRM.