CiviCRM - A Constituent relationship management for the Civic Sector
Vtenext - Vtenext is a platform that allows you to tackle CRM processes and customers with great ease.
Odoo CRM - Open Source CRM
Taimer - Taimer is a PSA solution designed for service companies to reduce the hassle in their work, get paid quickly, and sell more.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
ZEKI CRM - ZEKI CRM is a full-fledged and multi-features solution that enables businesses to fulfill all their needs in a single place.