PLC softwares

ABB
Alfa Laval
Allen-Bradley 
ALSTOM/Cegelec 
Automation Direct/Koyo/PLC Direct
B&R Automation
Cegelec/ALSTOM
Control Microsystems
Control Technology Corporation
Crouzet Automatismes 
Cutler Hammer
Divelbiss
Elsag Bailey
Festo
GE Fanuc
Grayhill
Hima
Hitachi
Honeywell
Horner Electric
Idec
Jetter
Keyence
Kirchner Soft
Klockner-Moeller
Koyo/Automation Direct/PLC Direct 
Microconsultants
Mitsubishi
Moore Products
Omron
Opto 22
PLC Direct/Automation Direct/Koyo
Pilz
Reliance
Rockwell Automation
SAIA-Burgess
Schleicher
Sharp
Siemens
SoftPLC/Tele-Denken
Tele-Denken/SoftPLC 
Toshiba
Z-World