MenuetOS (64bit and 32bit asm)

MenuetOS is an operating system in development for PC, written fully in assembly language (64bit and 32bit). Features include pre-emptive and real-time multitasking with multiprocessor support and Graphical User Interface. Menuet64 is released under License and Menuet32 under GPL. Menuet supports both 64 and 32bit x86 assembly programming for much faster, smaller and less resource hungry applications. 

Menuet has a 1.44 mb floppy version and a CD version.

Menuet isn't based on other operating system nor has it roots within UNIX or the POSIX standards. The design goal has been to remove the extra layers between different parts of an OS, which normally complicate programming and create bugs.

Menuet kernel is written in assembly, which gives speed and size advantages over systems written in other languages. For example, GUI with transparency is calculated in main x86-64 cpu, avoiding compatibility problems with graphics cards.

64bit Menuet can run 32bit Menuet applications.