ABB Ltd., Beckhoff Automation, Delta Electronics Inc., Eaton Corp. Plc, Emerson Electric Co., FANUC Corp., General Electric Co., Hitachi Ltd., Honeywell International ...
A trial version of TwinCAT, the open PC software system for PLC and NC Motion Control functions (Version 2.10 under Windows 2000/XP, Version 2.9 under Windows NT/2000/XP), can be downloaded for free.