MJML
Parcel is an official tool listed by MJML that supports and fully integrates with it so you can quickly and easily create responsive emails.
Append to the filename
Attaching .mjml to your email filename will make it an MJML email instead of the default HTML. This will auto-populate the basic semantic framework for you to get started.
Autocomplete tags
Parcel includes full Emmet support for MJML, hover information, and autocompletes of the MJML components and attributes.
MJML email design systems
Create MJML components to craft scalable email design systems, just like you would with HTML, but simplified with MJML.