RT-Thread is an open source IoT Real-Time Operating System (RTOS).

A secure embedded operating system for microcontrollers

Open source STM32 MCU programming toolset

Open source ARM Cortex-M microcontroller library

Real-Time Interrupt-driven Concurrency (RTIC) framework for ARM Cortex-M microcontrollers

TinyML AI inference library

Advanced fault backtrace library for ARM Cortex-M series MCU | ARM Cortex-M 系列 MCU 错误追踪库

Open source Python library for programming and debugging Arm Cortex-M microcontrollers

Low level access to Cortex-M processors

Template to develop bare metal applications for Cortex-M microcontrollers

modm: a C++23 library generator for AVR and ARM Cortex-M devices

Generate Rust register maps (`struct`s) from SVD files

An efficient and secure microkernel built for ARM Cortex-M cores, inspired by L4

An embedded development environment for mcs51/stm8/avr/cortex-m/riscv on VsCode.

The smallest public printf implementation for its feature set.

Source code for the book Real-Time C++, by Christopher Kormanyos

Rust keyboard firmware library with layers, macros, real-time keymap editing, wireless(BLE) and split support

CMSIS-DSP embedded compute library for Cortex-M and Cortex-A

Self-hosting metacompiled Forth, bootstrapping from a few lines of C; targets Linux, Windows, ARM, RISC-V, 68000, PDP-11, asm.js.