I just downloaded the Oxygene free command line compiler, and tried to read the EULA, which I did not quite understand. While there was a section about compiled programs and redistributables, I did not really understand what it meant as it seemed by and large to talk about the actual package I downloaded and installed and had nothing to do with programs I compile using the compiler. I'm not sure as well if I can post the EULA here as it may also be subject to its own copyright, so I apologise for that inconvenience as well.
So can I use the compiler to write open source programs and libraries?
You may not only write open source programs and libraries.
The compiler is free as in free beer: You may also get drunk with it. Meaning you are also allowed to develop (and sell) commercial applications build with the free command line compiler.
So have fun :)