SketchOS is a graphical operating system for OpenComputers.
SketchOS can use an EFI bootloader. Basically, this is a regular bootloader that (can) load code from the OS before booting.
SketchOS, as stated, is graphical. It can, however, be run in many environments because it can boot as a shell among other things.
SketchOS uses a powerful API system that is more effective than most.
For example, the render module. render provides safe, high-precision
graphics that will never crash.