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CJam
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CJam is a stack-based programming language inspired by GolfScript. It was created by aditsu in 2014. The official interpreter is written in Java.
Instructions
Consult the CJam cheat sheet (PDF) by User:Lynn.
Example code
Hello, world!
"Hello, world!"
Cat program
q
Truth-machine
ri{_p}h;
Turing-completeness
CJam is Turing-complete. To show this, writing a Brainfuck interpreter wouldn't be too hard. A lazier proof is to say that the Underload commands :()^ correspond to the CJam commands _{}~.