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MJML - The Responsive Email Framework
https://mjml.io/
A markup language that compiles to html that works in e-mail clients.
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Litmus e-mail testing
http://litmusapp.com/email-testing
if you've got to create html e-mail, this looks to be worth the money.
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Email Standards Project
http://www.email-standards.org/
Promotes correct rendering of html in e-mail clients
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Premailer — preflight for HTML e-mail
http://code.dunae.ca/premailer.web/
inspects and fixes html for email
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How to Code HTML Email Newsletters
http://www.sitepoint.com/article/code-html-email-newsletters/
Something I'd rather not need to know about.