Cusdis Comment
Cusdis comment is an open source and has a free hosting service for you to use.
Step #1: Create a Cusdis account and get site ID
You create a new Cusdis account
data-app-id
Step #2: Paste data-app-id into ghost setting
Then go to Setting > Design > Post > select Comment provider as Cusdis and paste data-app-id
in the 3rd comment id field.
data-app-id
in 3rd comment id
Save and done!