CiviCRM - A Constituent relationship management for the Civic Sector
EspoCRM - EspoCRM is open source CRM (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type.
ForceManager Mobile CRM - Gain sales management insight thanks to a more transparent team performance. Try ForceManager the leading mobile CRM for field sales teams worldwide.
Pipeliner CRM - Pipeliner CRM empowers small to medium-sized sales teams to close more deals and lower risk. Implementation and training are a breeze. Mac & Windows.
WORKetc CRM - All-in-one business management system. CRM + Social + Projects + Billing
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.