forth

http://astro.pas.rochester.edu/Forth/forth-justify.html
http://www.softsynth.com/pforth/pf_tut.html
http://www.forth.org/tutorials.html
http://galileo.phys.virginia.edu/classes/551.jvn.fall01/primer.htm
http://www.figuk.plus.com/what.htm
http://ficl.sourceforge.net/pdf/Forth_Primer.pdf