dyoo/moby-scheme. Another interesting thing for Android: a PLT Scheme (i.e., Racket) dialect and a suitable toolchain to run applications created from Racket Advanced Student Language + World Primitives (ASL is already quite an extensive Scheme dialect in Racket and the World Primitives are for reactive programming in Scheme) in JavaScript and then bundle them into Android applications. So programming Android phones in a reactive Scheme dialect. Or even shorter: parentheses for Android.