Cross-toolchains for Ada, C, C++, Fortran, and Free Pascal are provided. Run time interpreters for C#, Java, and Python 3 are also provided. Applications written for MuntsOS typically use libsimpleio for controlling I/O devices and can be highly portable even between board families like the BeagleBone and the Raspberry Pi.
MuntsOS is entirely open source. All original works are copyrighted and licensed under a 1-clause BSD license. Binaries are generally GPL because of the components they contain.
http://git.munts.com/arm-linux-mcu
http://git.munts.com/libsimpleio
Philip Munts, President
Munts AM Corp dba Munts Technologies