The KISS 32-Bit Drone Flight Controller from Flyduino has been designed to give drone racing enthusiasts a more simplified FC, but with full access to the software for customization. Once installed, you can choose your drone's airframe from the GUI, download presets from other pilots, or manually tweak the PID to your liking.
When coupling this FC with the (optional) KISS ESC from Flyduino, you get the ability to use built-in telemetry data on the OSD of your FPV goggles as a live feed, or within the KISS FC GUI. You can keep tabs on battery voltage, power consumption, ESC temperature, and motor RPMs.