Calvin 
Calvin is a very terse programming language, inspired by APL/J/K.
Installation
Using Git (Recommended)
git clone https://github.com/utkarshkukreti/calvin.git
cd calvin
bundle install
rake install
From RubyGems
gem install calvin
Usage
Run
calvin
to start the interactive REPL.
Documentation
No docs yet, but the language is heavily tested.
Best way to learn more is to read the specs in spec/.
License
The MIT License
Copyright (c) 2012 Utkarsh Kukreti