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.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
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.
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.
Zoho CRM - Omnichannel CRM for Businesses of all sizes
Clearbit - Clearbit provides Business Intelligence APIs
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.