Vtiger is an all-in-one CRM that is available in different languages and feature sets. The open source software is available free of charge in its basic version. However, different versions exist for different requirements, which in turn differ in their costs.
In addition to basic customer management and pipeline functions, a helpdesk system is also integrated into Vtiger. If you would like to send SMS with Vtiger, this can also be set up in a few steps to offer customers an additional service.