TempleOS, a modern operating system that taps into both C64 and the bible.

It’s like a modern, souped-up, multi-tasking, cross between DOS and a Commodore 64.  It has a C64-like shell with HolyC, a dialect of C/C++, instead of BASIC.  It was written from scratch, and not even ASCII was sacred — it has 8-bit unsigned character source code to support European languages.  Also, the source code has graphics.