Forth is a stack based procedural programming language, able to be found (or installed) on microprocessors, embedded systems, and personal computers. It encourages an itterative, exploratory style of programming, defining and redefining 'words' as programmes take shape.

• Packet Forth
• amforth
• open firmware
• gforth (aka GNU Forth) > http://www.complang.tuwien.ac.at/forth/gforth/
• implementations for a wide range of hardware can be found at http://www.forth.org/compilers.html
• jonesforth – heavily commented/literate → http://www.annexia.org/forth

• Forth_(programming_language)
• “thinking forth” > http://thinking-forth.sourceforge.net/
• The Forth Interest Group (FIG) > http://forth.org

• http://wiki.laptop.org/go/Forth_Lessons