RNode - Integrated, long-range data-radio that uses raw LoRa modulation in a variety of frequency bands.
TinyGo - Go compiler for small devices, based on LLVM.
Particle Store - Many cool IOT products to buy.
TinyFPGA - New series of low-cost, open-source FPGA boards in a tiny form factor.
Lacuna - Low-cost, simple and reliable global connections to sensors and mobile equipment.
Tock - Secure embedded operating system for Cortex-M based microcontrollers.
Shodan - Search engine for Internet-connected devices.
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.
Dumbass Home 2.0. (2019) - Internet of Things. How to Automate Your Rented Box Today.
Amazon FreeRTOS - IoT operating system for microcontrollers.
Senet - Cloud-based network connectivity platforms for the on demand build-out and management of the Internet of Things.
TDengine - Open-source big data platform designed and optimized for the Internet of Things (IoT).
WebThings Gateway - Web of Things gateway.
NATS - High-Performance server for NATS, the cloud native messaging system.
Liftbridge - Lightweight, fault-tolerant message streams.
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.
Zigbee2mqtt - Allows you to use your Zigbee devices without the vendors bridge or gateway.
Core Scenic Library - Client application library written directly on the Elixir/Erlang/OTP stack. Primarily aimed at fixed screen connected devices (IoT).