[jlemoine]

Firepad.io is missing from the list and has several derivate projects listed on their homepage.

[runako]

Author here, thanks for the feedback!

I wasn't aware of Firepad, but it (and some of the derivative projects) look like they are more in the category of "Web code editor" than "Web IDE". That said, I did mention Nitrous.io, Koding, and ShiftEdit, which all use Firepad.