https://www.sourcecodester.com/php/15895/simple-customer-relationship-management-crm-system-using-php-free-source-coude.html
https://gist.github.com/y0gesh-verma/a9e83220f268f0294a611b82cf266739
https://www.sourcecodester.com/sites/default/files/download/oretnom23/php-scrm.zip
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