Hydrogen is an operating system targeted for x86, amd64 and ARM architectures. Currently, it only supports x86, but amd64 and ARM will follow.
It has GDT, IDT, and uses serial instead of VGA text output. Because the main target is embedded computers and servers, support for VGA is not a main focus.
Memory management, paging and scheduling are the main focus for now. Network drivers, disk drivers and FS drivers are a second priority. Then there is other shiny stuff, like VGA, graphics acceleration (will most likely use AMD) and USB support (which probably wont be supported)
If you are a chipset/hardware manufacturer, and can provide datasheets (for networking ICs, graphics, USB chipsets, etc.), please, contact me.