I'm looking for some awesome people to join me in working on some of the Cycle.js projects I've released. Have a look at the list. If you're unsure about anything (such as wanting to help but being unsure if you're able/welcome) please contact me!
tricycle (difficulty: beginner-advanced)
Tricycle lets you try out Cycle.js in your browser. Try it out here.
Tricycle has lots of opportunities to help out and improvements would make a big difference to the community as for a lot of beginners Tricycle is their first introduction to writing Cycle code.