What point count (No of Tags) are you looking at and what kind of I/O frequencies? Can you also provide some detail on the hardware in use (DCS, PLC's). Are they OPC compliant ?
Depending on what what features are needed, you may consider Plantstreamer and a web based front-end system Plantbeat.These are products of Ciengis and we are in Europe (Portugal).
Please contact me (andrey[at]ciengis.com) if you need further info.
Thank you very much.
Best Regards,
Andrey Romanenko
Ciengis - Advanced Process Control and Optimization