These are some necessary library for C programming specially embedded programming.

1. Test : For testing C library

1. HashMap: Hash Map in C
2. Queue: Queue in C
3. TaskQueue: TaskQueue for asynchronous execution of multiple tasks
4. StaticHeap : Using this library static memory can be defined and use as dynamic memory instead of using heap in C
5. BuddyHeap : Using this library static memory can be defined and use as dynamic memory using buddy allocation instead of using heap in C

1. LPF: Low Pass Filter for control system
2. HPF: High Pass Filter for control system
3. PID: PID for control system

1. FFT: Fast Fourier Transform and inverse of it for signals