There's no one forth. A huge number of forth users end up writing their own forth, with different semantics, because it can be easier that way. Though you're r

There's no one forth. A huge number of forth users end up writing their own forth, with different semantics, because it can be easier that way. Though you're right, forths are unusually commercial. Forth is old, and in some ways it stayed old. A lot of people that use it now have used it since the 80s, so they're quite used to paying for compilers. There's also the fact that forths are used in very niche places, and the companies that use them are happy to pay up. You'll find a very open community with really nice people though.