LibTomMath is a free open source portable number theoretic multiple-precision integer library written entirely in C.

Open source ARM Cortex-M microcontroller library

An easy to use, easy to deploy crypto library

PX4 avoidance ROS node for obstacle detection and avoidance.

Style guides for PX4 source projects

A compact implementation of the UAVCAN/CAN protocol in C11 for high-integrity real-time embedded systems