Experlogix CPQ - Proposal management, quoting, and product configurator
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.
Oracle CPQ Cloud - CPQ software & Quote-to-Cash app
CiviCRM - A Constituent relationship management for the Civic Sector
CloudSense - CPQ and order management native to Salesforce
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.