Crust CRM - Crust CRM is an open source CRM with features like lead and account management, product management...
SuiteCRM - SuiteCRM, Open Source CRM for the world Fully featured Open Source CRM, as powerful as Salesforce and Dynamics. Try the online demo! Online Demo Sign up for the SuiteCRM Master Classes. First class on June 6! Download
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Mautic - Mautic is marketing automation software (email, social, & more).
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.
ERPNext - The ERP Software that helps you take full control of your business. ERPNext is both powerful and easy to use.