Programming languages with interactive online tutorials

Javascript
http://www.codecademy.com/

Python
http://www.trypython.org/

Ruby
http://www.tryruby.org

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Coffee Script
http://coffeescript.org/

JSON
http://braincast.nl/samples/jsoneditor/
http://jsoneditor.net/
http://www.jquery4u.com/json/10-online-json-tools/

JSON Select
http://jsonselect.org/#tryit

XML and XSLT
http://www.ladimolnar.com/JavaScriptTools/XSLTransform.aspx

HTML & CSS, XML, Browser Scripting, Server Scripting, Multimedia
http://www.w3schools.com/sitemap/default.asp#examples

With the exception of those sites below the dashed line these examples have tutorials placed alongside, and interact with, the user input. The Coffee Script site places examples and user input on separate pages, and the other examples have a similar level of separation.


I'll add others to this list as I discover them, but please feel free to add your own in the comments below.

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