STM32 core support for Arduino
Open Source Flight Controller Firmware
Arduino FOC for BLDC and Stepper motors
Wifi & BLE driven passenger flow metering with cheap ESP32 boards
A Java-based cross-platform build system.
A Interface to adapt modern SD Card to the old MSX computers
A hamradio DSP tranceiver on a Cortex-M4 MCU (STM32F4xx)