LabVIEW CANopen client library
Building automation (like KNX or OpenHAB) software (like CometVisu).
instrument control, data acquisition display and analysis
Fast CGI-based AsteriskPBX cluster administration tool.
Another HMI/SCADA set of tools written in C++(Qt) with python bindings
Open Source Hardware For Industrial Automation
IP Thermostat Managment Tool