Network Wizards Software Archive
This Unix C code monitors an Aqualink brand pool/spa controller. You will need to have the Aqualink-PC interface connected to a serial port on your Unix system. The program outputs an HTML formatted file whenever the pool status changes, so you can monitor it from a web browser. It will probably require customization to match your particular Aqualink configuration. It is also possible to control the Aqualink but the code to do this hasn't been implemented yet.