Top Websites for markup language

dokuwiki.org

A simple to use, standards compliant wiki engine.

css-validator.org

Validates CSS stylesheets to ensure they conform to standard...

orgmode.org

A versatile organizational system for GNU Emacs.

mjml.io

A framework designed to simplify responsive email coding.

asciidoc.org

A plain text markup language for writing technical content.

docbook.org

Official home page for DocBook documentation.

fpml.org

Standard for financial products markup language

railml.org

An initiative supporting the development of railML, an open-...

docuwiki.net

A free and open-source wiki software.

greensmartmobility.com

Exploring HTML5 and its impact on web development.

haml.info

A template engine for Ruby on Rails.

texy.info

Human-friendly markup for PHP, generating clean HTML.

mathml-association.org

Promoting the use and development of MathML.