Eclipse IoT is the IoT open-source community within the Eclipse Foundation. It brings together projects for IoT, edge computing and related uses. Well-known parts include Eclipse Mosquitto, a lightweight MQTT broker for MQTT 5.0, 3.1.1 and 3.1 that also runs on small boards; Eclipse Hono, which connects devices to back-end applications through a single API over HTTP, MQTT, AMQP and CoAP; and Eclipse Ditto for digital twins. It is not one product with one service, but a collection of building blocks that you select, install and operate yourself. The projects are released under open-source licences, such as the Eclipse Public License.
The Eclipse Foundation is an international not-for-profit association chartered in the European Union (AISBL), headquartered in Brussels. Because Eclipse IoT is not a hosted service, you decide where your data runs and who operates the infrastructure. The source code is public, so you are not tied to a single vendor. For a European organisation this does require in-house operating capacity or a partner that provides support.