Chamaileon (https://chamaileon.io) is a collaborative email design platform for designers and marketers that lets them create bespoke email templates with ease.

Chamaileon's email design platform - features the most flexible email builder interface in the industry - has real-time collaboration (like in Google Docs) - prepared for sophisticated user role handling & shared asset management - has a built-in review and approval workflow - is prepared for email accessibility standards - produces bulletproof responsive email code that is compatible with email accessibility standards and VML background images that are required by Outlooks The software works in combination with any email marketing software and has easy to configure integrations with Mailchimp, Campaign Monitor, Marketo, Iterable, Braze, Bronto (Oracle Netsuite), Sendgrid, Mailgun, Sparkpost, Constant Contact.

Check the tutorial here: