PwnOS is an operating system being written from the ground up to be ideal for making the most of resource-rich dedicated server systems.
The most significant section of the project is to create a core (kernel) that is designed to be best suited for servers (e.g. usually one process with many threads of varying priorities). Much (highly-regulated) assembly language and some C is used here to increase the performance and decrease bloat potential, (because to code this in assembly, it's ESSENTIAL to have excellent, lean code design).
Development of PwnOS will be switching to be done with PwnIDE once PwnIDE reaches version 0.2.4. Development so far has been done with RadASM and MASM32 for assembly, and Dev-C++ and MinGW for C/C++. Documentation is produced with Natural Docs. Custom linking is done with a utility called JLOC, and drive image writing is done with various utilities.
To get in on the action, don't hesitate to contact me. Check out the official homepage for more info. Right now the boot loader's almost done, and intense work on the core is underway.