I'd like to use this to provide a development environment for a friend in Africa trying to learn to program. He has random access to random computers so any client side install is a problem.
I would be happy to pay for the product or just pay someone to build it if it isn't hard.
Here are my assumptions:
1. I could enable this on a cheap cloud server to expose a terminal that will work with tmux and vim.
2. I could create an account for my friend(s) so that they could access the server securely from within thier browser.
3. There is no clientside install or config needed.
Let me know if you are willing to wire it together.
I recommend taking a look at CodePicnic, which gives him a fully-functional Linux image front-ended by a JavaScript UI which you can embed anywhere. I have successfully used it from e.g. iPhone Safari.
For historical reasons, it is most popular with Twilio developers. I find it indispensable for doing any sort of development where you need to get asynchronous callbacks from your API of choice.
[0] http://pagekite.net/