DurexForth is a modern implementation of the language Forth for the Commodore 64, and the team behind its development has just released the version 1.4.3.
This new version brings bug fixes and some new additions. If you never tried, Forth is a language very different than the traditional ones, so to speak. Compared to C64 Basic, Forth is more attractive in almost every way. It is a lot faster, more memory effective, and more powerful.
DurexForth is a great implementation that runs natively on the C64. One of the best features, in my opinion, is the amazing User Guide. There you have an introduction to the language, examples and much more. It is worth to give it a try if you are a curious programmer!