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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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Neocities: Create your own free website!
https://neocities.org/
Brings back the whole geocities web-tinkering aesthetic.
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Mavo: A new, approachable way to create Web applications
https://mavo.io/
Creates dynamic elements based on HTML properties
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Table generator
http://www.tablesgenerator.com/html_tables#
does what it says on the tin. converts tsv/csv data into HTML/Markdown/Latex or legible text table formatting
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Modern Web Development
http://jtaby.com/2012/04/23/modern-web-development-part-1.html
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SlickMap CSS Demo
http://astuteo.com/slickmap/demo/
Create an organizational chart in plain-old html
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Roots WordPress Theme | Rapidly create sites with HTML5 Boilerplate and Blueprint CSS
http://www.rootstheme.com/
Neighborhood artist who converts tires to planters. Really nice.
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Zen Coding: A Speedy Way To Write HTML/CSS Code
http://www.smashingmagazine.com/2009/11/21/zen-coding-a-new-way-to-write-html-code/#more-16072
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30 Handy Cheat Sheets and Reference Guides for Web Professionals
http://www.webdesignerdepot.com/2009/07/30-handy-cheat-sheets-and-reference-guides-for-web-professionals/
Sort of the cheat-sheet cheat sheet.
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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.
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50 Useful Design Tools For Beautiful Web Typography | CSS, Fonts | Smashing Magazine
http://www.smashingmagazine.com/2009/01/27/css-typographic-tools-and-techniques/
Really slick CSS framework with lots of dynamic bells and whistles
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Fluid 960 Grid System | 16-column Grid
http://designinfluences.com/fluid960gs/
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S5: A Simple Standards-Based Slide Show System
http://meyerweb.com/eric/tools/s5/
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Gallery of CSS for tables
http://icant.co.uk/csstablegallery/index.php?css=27
A nice complement to listmatic