Forth
Forth on RPi
wget http://www.fourmilab.ch/atlast/download/1.2/atlast-1.2.tar.gz
tar -xzvf atlast-1.2.tar.gz
cd atlast-1.2/
make
Start the Forth interpreter with ./atlast
atlast.html and atlast.pdf is included and an is an extensive atlast-forth manual.