CoreCRM (formerly x2Engine)

CoreCRM is a lightweight, PHP-based open-source CRM designed for simplicity and quick deployment. It includes contact management, lead tracking, email integration, and basic reporting. The platform stands out for its minimal resource requirements and straightforward installation process. It's particularly suitable for small businesses or teams that need basic CRM functionality without complex setup. The clean interface and essential features make it an accessible entry point into open-source CRM solutions.