Translates Oberon to JavaScript code ready to be run in web browser or nodejs. Compiler itself is written in Oberon (with extensions) and compiled to JavaScript. The compiler supports both "pure" and "plus extensions" mode. Pure mode is a strict implementation of original Oberon language report. Language extensions implemented in my own way and available as a separate compiler mode.
You can try the compiler online here.
To build it locally run "python build.py html" (Python 2.x or 3.x is required). It will make _out/os.js and _out/oberonjs.html. Open oberonjs.html in the browser and try the compiler!