FHEM - FHEM (TM) is a GPL'd perl server for house automation.
TWedge - TWedge enables you to capture data from devices like bar code readers, scanners, decoders, gauges...
Conrad Connect - Service for managing smart home devices
OPC Router - The OPC Router is one of the leading data hubs and OPC gateways in the Industry 4.0.
Homebridge.io - Homebridge is a lightweight NodeJS server you can run on your network that emulates the iOS HomeKit...
Node-RED - Node-RED is a programming tool for wiring together hardware devices, APIs and online services in new and interesting ways.