PLCs.net - FREE Online PLC Simulator
PLC Simulator - Free from TheLearningPit.com
TheLearningPit - PLC Simulators and Resources for Training.
LADSIM - PLC Simulator
PLC simulator | Free Development software downloads at SourceForge.net
PLC training - PLCTrainer CBT, tutorial, logic simulator.
Siemens PLC training - S7-200 PLC trainer, option MicroWIN 4 software
Siemens PLC training - S7-200 PLC trainer, Microwin