BitVisor is a tiny hypervisor initially designed for mediating I/O access from a single guest OS. Its implementation is mature enough to run Windows and Linux, and can be used as a generic platform for various research and development projects.
Tiny (less then 1000 lines of code) education compiler that can compile itself. Implements small subset of C language without pointers, structures etc. Parameters and local variables also not implemented. To interface with OS Borland-style inline assembler are used (db directive only). Based on initial version of Tiny Context compiler (http://avhohlov.narod.ru/p1805en.htm).
BASIC interpreter for the standard (SUS) character screen handling library, which fully corresponds to the Tiny BASIC standard. The code is thread-safe and can be embedded into other code. Can be used as a game or a minimalist challenge.