[1] http://jupyter.org/ [2] https://yhathq.com/products/sciencebox
- https://wakari.io/ -- closed source, IPython, freemium/enterprise
- https://cloud.sagemath.com -- open source; more academia oriented; completely free (right now) [disclaimer: I founded this]
- https://c9.io/ -- open source, freemium
- http://runnable.com/ -- closed source, no business model
- https://www.pythonanywhere.com/ -- closed source, freemium
- https://www.terminal.com/ -- closed source; freemium
- https://www.nitrous.io/ -- closed source; freemium
- https://codio.com/ -- closed source; freemium (free for public)
- https://codenvy.com/ -- closed source; freemium/enterprise
- https://koding.com/ -- closed source; freemium
- http://www.wolframcloud.com/ -- closed source; expensive
[1] http://jupyter.org/ [2] https://yhathq.com/products/sciencebox