Virtual CPU with full user/supervisor and virtual memory support, fast enough to support self-emulation.

Fast C-subset compiler allowing on-the-fly compile-and-go of all applications.

Network clients & servers, remote OpenGL, GUI applications, and many other nifty features.

Runs under Windows or Linux.

See the 00README.txt for full details and a step-by-step walkthrough tutorial.
Found via https://www.tuhs.org/pipermail/tuhs/2017-January/009247.html