Reshared post from +Paul Irish

Web-based IDEs:

try.devtable.com
shiftedit.net (works offline!)
icenium.com
codio.com
code.google.com/p/collide/ .
compilr.com
akshell.com
codiad.com
plnkr.co
c9.io
koding.com (invite only)
codenvy.com (invite only)

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