We run http://pvbrowser.org According to our opinion data acquisition must be portable.
We use a shared memory and a mailbox. see: http://pvbrowser.de/pvbrowser/pic/prinzip.png
An alternative to a shared memory might be a database table which is memory mapped E.g. http://dev.mysql.com/doc/refman/5.0/en/memory-storage-engine.html
We support Modbus (Serial Line and TCP) Siemens TCP Siemens PPI Ethernet_IP EIBnet/KNX OPC XML-DA PROFIBUS CAN DCON protocol
Which protocols do you support ?
Are you interested in cooperation ? For contact see: http://tech.groups.yahoo.com/group/pvbrowser/
This site seems to be down. Right ? There has been no response for over 1/2 an year. You can contact me as written above.