php-rgraph is free software (as is Joomla!) - however you have to adhere to the GPL-license conditions to use it.
Please learn more about GPL and free software at GNU Org.
To download php-rgraph please click the download button:
Version 2.1.1 (Build Level 18.104.22.168 - September 16th 2020)
Version 2.1.0 (Build Level 22.214.171.124 - August 18th 2020)
php-rgraph Version 2.1.0 for Joomla! Version 3 and 4
Version 1.2.4 (Build Level 126.96.36.199 - May 13nd 2020)