IEC 60870-5-104 protocol tester.
A python based control system
Open source SCADA
LabVIEW CANopen client library
Building automation (like KNX or OpenHAB) software (like CometVisu).
A python based User Interface library.
Open Source Hardware For Industrial Automation
openSCADA® is an open source SCADA system written in JAVA
ModBus for Mobile Platforms
IP Thermostat Managment Tool