Well, he kept changing them enough to break compatibility & even how you express concepts at times. Oberon is both a language and a name for a whole family of languages that represent his people's life-long experimentation with simple, language design.

Unlike Cardelli, his weren't ultra-practical but they did try with a commercialized one called Component Pascal. It got significant adoption for a Wirth language along with IDE. As usual, the BNF grammar is pretty small despite its expressive power. It kind of came and went far as adoption but people are still apparently posting to the forum in 2016.

https://en.wikipedia.org/wiki/Component_Pascal

http://blackboxframework.org/index.php?cID=home,en-us

Cool, thanks for the pointers :)