Mbed is a development platform and operating system for internet-connected devices (Internet of Things devices) based on 32-bit ARM Cortex-M microcontrollers. The project was a collaboratively developed by Arm and its technology partners. As of July 2024 Mbed is no longer actively developed by Arm.
The full version is a real-time operating system (RTOS) while more resource constrained devices can opt to use a non-RTOS subset.