Hi guys,
Do you have in plan to add Freedns for Let’s Encrypt Add-on?
Best Regards,
Remember to vote for your own suggestion. 
The service is running on afraid.org and not afraid.com! Be sure to make the facts correct or developers will just ignore it and take some easier task.
The afraid.org FAQ have a command to update the TXT record for a DNS challenge, so the option is available.
FreeDNS FAQ