Skystars F4+KO50 is an affordable stack for freestyle and racing quadcopters. The flight controller with an F405 processor and ICM42688 gyro features 16MB of memory for the blackbox, as well as 5V/3A and 10V/2A BEC. The flight controller also has an integrated barometer for altitude measurement. It also features a connector for DJI FPV and OSD, making it suitable for drones with both digital and analog video transmission. There are also convenient pads for connecting LEDs in the corners of the board. It is paired with a 50A ESC running BlHeli_S firmware.
Wiring diagram can be found here.