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.

Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.

CiviCRM - A Constituent relationship management for the Civic Sector

Kindful - Nonprofit donor database + fundraising tools all in one

Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.

Classy - Expressive, flexible, and powerful stylesheets for native iOS apps