National Instruments sells 2 SCADA ( Supervisory Control and Data Logging) : Lookout and LV-DSC+ IA servers, both of which can act like OPC Servers. Presently, we have a beta version of the CAN driver to work with these OPC servers. These 2 SCADA packages work with a host of third party I/O devices etc. If you already have either Lookout or LV DSC , then I can send you the beta CAN file to work with. However, purchasing Lookout /LV DSC to work primarily with CAN may not be feasible at this time, 'coz we are still working on testing and improving the CAN driver.
Also,Developers are working on creating an OPC Server specifically for the CAN protocol but the release date may be a few months away.