We're moving all of FreeCodeCamp.com over to React. Berkeley Martinez (https://twitter.com/berkeleytrue) has been working on this for a couple months, and it's already live at http://beta.freecodecamp.com - check it out and if you discover any new bugs, create a GitHub issue and add the "beta" tag 😄
In the medium term, we are adding a multi-file editor. This is basically a simplified version of CodePen running right in our challenge framework. So you'll be able to build your projects right on FreeCodeCamp.com
And in the long term, we want to implement live pair programming on challenges, and a system that matches you with another camper in real time so you can pair program.
We are still early days (we just launched 21 months ago). There are so many things we will do with Free Code Camp.