hsnock (hackage): This is an implementation of the Nock 5K spec with an accompanying interpreter.  Nock is a tiny stateless virtual machine that can be thought of as a functional assembly language. Nock is the lowest layer in the Urbit stack. On top of it rests the Hoon language, in which the Arvo OS is written.  More on Urbit: http://www.urbit.org/  More on Nock: http://www.urbit.org/2013/08/22/Chapter-2-nock.html
Keywords: language|library|program|public-domain