You might like to check out MenuetOS/KolibriOS and the old QNX demo disk. Both provide GUIs and rudimentary Web browsers. QNX was full POSIX, too, although the

You might like to check out MenuetOS/KolibriOS and the old QNX demo disk. Both provide GUIs and rudimentary Web browsers. QNX was full POSIX, too, although the demo disk didn't include a terminal.