Mainflux is modern, scalable, secure open source and patent-free IoT cloud platform written in Go.
It accepts user, device, and application connections over various network protocols (i.e. HTTP, MQTT, WebSocket, CoAP), thus making a seamless bridge between them. It is used as the IoT middleware for building complex IoT solutions.
LoRa Server is an open-source LoRaWAN network-server, part of the LoRa Server project. It is responsible for handling (and de-duplication) of uplink data received by the gateway(s) and the scheduling of downlink data transmissions.