CiviCRM - A Constituent relationship management for the Civic Sector
Composity - Composity is software solution for more efficient business! CRM, Inventory, POS, Invoicing, Financials and Accounting, Sales and Purchase modules, Document management, Website and eCommerce
Odoo CRM - Open Source CRM
monday CRM - monday sales CRM is a customizable customer relationship management software for every business with support for unlimited leads and accounts and prepaid plans.
Salesforce - CRM software solutions and enterprise cloud computing from salesforce.com, the leader in CRM and platform as a service.
Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses