Keep in mind that it has been decades since I was a FORTH programmer. I'm half fearing and half hoping someone will correct what I'm about to say :-) Essentia

Keep in mind that it has been decades since I was a FORTH programmer. I'm half fearing and half hoping someone will correct what I'm about to say :-) Essentially, you want FIG FORTH. Virtually anything will give you that. Remember that FORTH doesn't really have libraries. It's more like Smalltalk where you have a running environment of loaded code. Generally you want to have a small kernel and then load only the words that are relevant to what you are doing. For that reason, there isn't really any big standard library (that I'm aware of) like there are with other languages. FORTH words decompile really, really easily too, so mostly FORTH programmer work with source code. You just load what you need from wherever you get it. Having said that, there have historically been attempts to have libraries and create build environment, etc, etc. I'm not aware of any that achieved any universal popularity.