This paper introduces OpenMote, the latest generation of Berkeley motes. OpenMote is a open-hardware prototyping ecosystem designed to accelerate the development of the Industrial Internet of Things (IIoT). It features the OpenMote-CC2538, a state-of-the-art computing and communication device. This device interfaces with several other accessories, or “skins”, through a standardized connector. The skins developed to date include boards to provide power, boards which enable a developer to easily debug the platform, and boards to allow seamless integration of an OpenMote network into the Internet. This hardware ecosystem is complemented by a suite of software tools and ports to popular open-source IoT implementations. The OpenMote platform is for example tailored to run the OpenWSN open-source implementation of emerging IIoT standards. The combination of hardware and software ecosystems gives an embedded programmer an intuitive and complete development environment, and an end-user a fully working low-power wireless mesh networking solution running the latest IIoT standards.