Forth

An awesome stack based programming language, which is able to extend itself during runtime.

\ a comment followed by the shortest quine
source type

\ another shorty, hello world looks like that
." hello world"

\ tell me, what else can we do? ask the system itself!
words \ this will yield all defined words

Systems

Forth is a highly interactive language with interactive compilation, that's why we call the compilers Forth Systems. The parser is always visible to the programmer! Here are some modern Forth Systems to get you started.

Gforth

GNU Forth, completely free software.

µC
GNU
Droid
WIN
OSX

VFX

The fastest code generator

µC
GNU
WIN
OSX

SwiftForth

Rock solid, kept simple and went to space

µC
GNU
WIN
OSX

Please let us know if a modern, actively developed system is missing in this list.

Communities

comp.lang.forth

Ancient, yet highly active news group.

Forth e.V.

Germany's leading Forth community, with members from Austria, Netherlands and USA.

Forth Interest Group

Located in Silicon Valley, the first big Forth community

HCC Forth

Netherlands' group of enthusiastic users of the Forth programming language.

ForthHub

Unites all Forth Programmers on GitHub