RTS2 is project to create an open source environment for control of a fully autonomous observatory. It is running about dozen fully autonomous observatories. Its modular design allow easily addition of new devices (to already huge supported HW list).
syphon is an extension for mod_openopc, to monitor telnet devices (serial devices) that sit on Serial -to- Ethernet bridges (such as barcode scanners) and export parsed data to an OPC compliant device (such as a PLC).