Skystars F4+KO50 is an affordable stack for freestyle and racing drones. The flight controller with F405 processor and ICM42688 gyro has 16MB memory for blackbox and 5V/3A as well as 10V/2A BEC. The flight controller also features an integrated barometer for altitude measurement. The unit includes a connector for connecting DJI FPV and OSD, making it easy to use on a drone with digital and analog video transmission. It also has pads for connecting LEDs in the corners of the unit. It is complemented by a 50A ESC with BlHeli_S firmware.
You can find the wiring diagram here.