Vtiger is a PHP-based, open-source CRM application which forked off SugarCRM. Very suitable for small and medium enterprises, it uses the Smarty template engine. One can also import and export specific modules with or without customization.
Links
- Vtiger website: https://www.vtiger.com/
- Vtiger documentation: https://community.vtiger.com/help/index.html
- Vtiger wiki: https://wiki.vtiger.com/index.php/Vtiger_CRM
- Vtiger forum: https://discussions.vtiger.com/