Dynamically generated PDF attachments for Freeform submissions
How to attach dynamically generated PDF file to Freeform email submission in Craft CMS
#PHP modules
Using template hooks in Craft CMS
Template hooks can be used to inject content into various places of the control panel to enhance its functionality
Using incognito field plugin for Craft CMS
Learn how you can use incognito field plugin in your custom Craft CMS modules.