Repl.it Multiplayer
Really cool, Repl.it is the best online bite-sized programming platform I've ever used. The breadth of languages offered is surprising (Brainfuck and Scheme?!), and things I would have thought wouldn't be supported were supported.I say this in spite of an excruciating experience I had a few weeks ago where I led a Python for absolute beginners day-long workshop. I had tried Repl.it before writing the course materials and was mind-blown at how everything just worked, including the filesystem, which I needed for downloading NLTK modules. I decided to design the materials around Repl.it, letting me spare the class the possibly excruciating and definitely not fun experience of downloading and configuring Python and an IDE. Unfortunately, on the day of the workshop, Repl.it just didn't work for half the class, and for most of the rest, it was really, really slow. Hopefully this was just a hiccup.