Here is the list of the things that are missing and in what order they will be done:

Kernel

• [x] Sierra Libc in freestanding mode. (partially)
• [x] Multiboot
• [x] Terminal Interface (TTY)
• [x] Creating a Build System
• [x] Stack Smash Protector (not doing that anymore)
• [ ] GDT and Interrupts (IDT & IRQ as well)
• [ ] Memory management:
• [ ] Paging
• [ ] Memory Allocation Functions
• [ ] Kernel Heap
• [ ] Virtual Memory Objects
• [ ] Multitasking
• [ ] Basic Time Driver
• [ ] Keyboard Driver
• [ ] Initial Ramdisk (initrd)
• [ ] VFS
• [ ] Filesystem support (ext2)
• [ ] Internal Kernel Debugger (not sure if I will do it)

User Space

• [ ] Sierra Libc in hosted mode (Will feature a basic POSIX API with the needed features only) (Porting Newlib is also an option).
• [ ] TSS
• [ ] User Mode
• [ ] ELF program loading driver.
• [ ] System Calls
• [ ] Simple Shell
• [ ] OS specific toolchain

Extras

• [ ] Extended Sierra Libc (More POSIX support)
• [ ] Extended Time Driver
• [ ] Threads (pthreads)
• [ ] Threads Local Storage
• [ ] Symmetric Multiprocessing
• [ ] Secondary Storage (USB, Floppy, Hard drives, etc)
• [ ] Sound Driver
• [ ] Real Graphics Driver
• [ ] GUI

Bootstrapping

• [ ] Porting Software (GCC, Binutils, bash, Make, etc..)
• [ ] Port Build System
• [ ] Become Self Hosted