X2CRM is an open-source CRM application written in PHP, described by its developer as a social sales application for small and medium-sized businesses. X2Engine's modules cover sales, marketing, customer service, HR and project management, with automation and a custom module builder, X2Studio, for creating tailored modules in PHP. You install the software on your own web server with a MySQL database; an internet connection is needed for automatic updates and for capturing web leads.
X2CRM is developed by X2Engine, Inc., which describes itself as a US company. Because the software is installed by the user, the administrator decides where the data is stored and who can access it. The source code is on GitHub; the latest release listed there dates from 2019. A European organisation considering X2CRM should check how actively it is maintained and who supplies security updates. Hosting in the EU is possible but remains the user's responsibility.