XDev is open and free set of compilers, additional tools, libraries and design patterns for cross-platform and embedded development in Oberon-2 language. DosDev, WinDev, LinDev, NesDev, MsxDev and ZXDev are XDev's subsystems for target platforms MS-DOS, Windows 32/64bit, Linux, Nintendo/NES, MSX and ZX Spectrum.