Forth is an ANS standard programming language.

ANS Forth 1994

The latest standard actually published was in 1994.
You can download a copy from this website if you like, based on the permission given in the document itself:

Permission is hereby granted to copy this document provided that it is
copied in its entirety without alteration or as altered by (1) adding text that is clearly marked as an insertion;
(2) shading or highlighting existing text; and/or (3) deleting examples.

dpans94.pdf

I do not host an html version, but here is a link to one.

Forth 200x

There is some effort currently to publish a new standard which will be named Forth 2012 or Forth 2013.
There is a website set up for it http://www.forth200x.org/.