A hobbyist OS that I'm developing.

What works right now:

• Interrupts (HW and SW)
• Physical / Virtual memory allocation
• Paging
• Kernel heap allocation
• Task switching (right now, it only runs tasks in kmode)
• In-kernel IPC (message based, basically consists of passing around pointers to kernel memory)
• The PS/2 controller and keyboard drivers
• VGA console driver
• In-kernel libc
• In-kernel lua integration

What I'm planning on implementing (at some point, and in a rough order):

• ATA drivers
• Filesystems
• User-mode programs
• Graphics / a GUI
• Networking
• Extensive documentation

I'm making most of the design up as I go along, and mostly just implementing what seems like the easiest choice. Of course, I'm also looking for challenges as well, so...