CMSIS

Arduino

arduino/arduino-ide

Popular

Beginner-friendly C++ framework, IDE and CLI with a huge library ecosystem; Arduino is now part of Qualcomm.

PlatformIO

platformio/platformio-core

Popular

Cross-platform build system and VS Code extension for 1,000+ boards and dozens of frameworks, with library management.

ESP-IDF

espressif/esp-idf

Popular

Espressif's official FreeRTOS-based SDK for ESP32 chips with Wi-Fi, BLE, Thread, Matter and OTA support.

Arduino-ESP32

espressif/arduino-esp32

Arduino core for Espressif ESP32 chips built on ESP-IDF; the quickest path to Wi-Fi and BLE prototypes.

STM32Cube

st.com

Popular

ST's HAL and LL drivers, CubeMX code generator and CubeIDE for the dominant STM32 microcontroller family.

Raspberry Pi Pico SDK

raspberrypi/pico-sdk

Official C/C++ SDK for RP2040 and RP2350 chips with PIO programmable I/O and CMake-based builds.

nRF Connect SDK

nrfconnect/sdk-nrf

Nordic's Zephyr-based SDK for Bluetooth LE, Thread, Matter, Wi-Fi and cellular IoT on nRF chips.

Pigweed

pigweed-project/pigweed

Rising

Google's modular embedded C++ libraries and Bazel-based tooling, used in Pixel and Nest device firmware.

ArduinoJson

bblanchon/ArduinoJson

JSON library for Arduino and embedded C++. Simple and efficient.