ATDriver Server V2.5.1 is a realtime driver server that contains modbus RTU, modbus TCP/IP, S7 Ethernet Client/Server communication protocols attached for free!.
ATDriver Server works on plug and play mechanism for driver plugins. Members in ATSCADA Open Automation Ecosystem can develop various of drivers for sales. Currently, you can download and use many kind of drivers on this website as: mitsubishi PLC driver, Omron hostlink, EtherCAT, …
ATDriver Server is a realtime server that supply realtime data collected by driver plugins to ATSCADA apps.
This is a free license product of ATSCADA Lab. So you can use it freely for communicating with open automation worlds.
You can download and use it freely by clicking this LINK.