Joomla!
Joomla! 3, 4: mod_gtranslate.4.0.3.zip
Joomla! 5, 6: mod_gtranslate.7.0.1.zip
Please check the Joomla Module Documentation.
Drupal
Get the module from: Translate Drupal
Please check the Drupal Module Documentation.
WordPress
Get the plugin from: Translate WordPress
Please check the WordPress Plugin Documentation.
Shopify
Install the app from: Translate Shopify
Please check the Shopify App Documentation.
Other HTML
Configure and get the HTML code from: Website Translator Widget