Sorry these lack any detailed explanation. They were made either for school or for a competition so they had dedicated detailed design reports that were handed in to the people concerned.
Custom SoC with a RISC-V CPU with additional custom instructions and some peripherals.
Autonomous Drone Control Software for Custom Built Rotary-Wing Drone
The program accomplishes the task of collecting water from a blue colored pool and releasing it in a red colored pool, whose precise locations are unknown. The image processing part and the functions that use peripheral ports to control the water sucking/releasing motor were made by other team members.
Ground Control Station for Custom Built Rotary-Wing Drone
The GUI communicates with the drone using a "backend" program that takes care of the communications stuff.