Sonoff-Tasmota - Alternative firmware for ESP8266 based devices like iTead Sonoff with web UI, rules and timers, OTA updates, custome device templates and sensors support.
Arm Mbed OS - Free, open-source embedded operating system designed specifically for the "things" in the Internet of Things.
Edge Impulse - Enables developers to create the next generation of intelligent device solutions with embedded Machine Learning.
ESP8266 series chips - system-on-chip (SoC) which integrates a 32-bit Tensilica microcontroller, standard digital peripheral interfaces, antenna switches, RF balun & more.
Packet Broker - Neutral and open Internet of Things packet broker allowing IoT operators to interoperate according to the open principles of the internet. (Client) (Go API) (API)
EVE - Aims to do for the IoT edge what Android did for mobile by creating an open edge computing engine that enables the development, orchestration and security of cloud-native and legacy applications on distributed edge compute nodes.
Adam - Reference implementation of an LF-Edge API-compliant Controller.
rtlamr - rtl-sdr receiver for Itron ERT compatible smart meters operating in the 900MHz ISM band.
Nerves Platform - Open-source platform and infrastructure you need to build, deploy, and securely manage your fleet of IoT devices at speed and scale. (Code) (HN) (Talk) (HN)
Nerves Livebook Firmware - Lets you try out the Nerves projects on real hardware without needing to build anything.
Octopi - Research effort for creating an environment in which secure internet-of-things can be developed.
Connected Home over IP - Working Group to develop and promote the adoption of a new, royalty-free connectivity standard to increase compatibility among smart home products, with security as a fundamental design tenet. (Web)
RT-Thread - Open source IoT operating system. (Web)
EMQ X Broker - Scalable and Reliable Real-time MQTT Message Broker for IoT in 5G Era.
EMQ X Kuiper - SQL based IoT rule engine running at resource constrained edge devices. (Code)
IoTGoat - Deliberately insecure firmware created to educate software developers and security professionals with testing commonly found vulnerabilities in IoT devices. (Web)