AngularJS Learning Playground ( with Twitter bootstrap, Google maps API, TDD using Karma runner )

Interactive Playground / Literate Programming for Scala —

Bot Command Center for testing the GitterBotX

HTML, CSS and JavaScript playground

HTML, CSS and JavaScript playground

playground for code about quaternions

3D playground

Data Science stuff

Playground for Mimosa 2.0, Marionette Apps with node-orm2 + Semantic UI support (coming)

Dielectric is a playground for coming up with a more functional way of interacting with Spark.

A playground repo for APIs