Subtle 
Subtle is a Terse, Array based Programming Language, heavily inspired by the K Programming Language, and partly by APL and J.
Installation
Using Git (Recommended)
git clone https://github.com/utkarshkukreti/subtle-lang.git
cd subtle-lang
bundle install
rake install
From RubyGems
gem install subtle-lang
Usage
Run
subtle
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