SuiteCRM

SuiteCRM is a popular, open-source fork of SugarCRM Community Edition, offering a fully-featured, self-hosted CRM solution. It provides sales force automation, customer support, and marketing campaign management.

Its primary advantage is zero licensing fees and complete control over code and data, making it highly customizable for developers. It has an active community and commercial partners for support. Target users are tech-savvy organizations, non-profits, and businesses with specific customization needs or data residency requirements that preclude cloud solutions. It scores for its powerful free core and flexibility, though it requires technical resources for setup, maintenance, and customization.