The 4.06 version of S7-Simulation is available as a free download on our website. The program lies within Development Tools, more precisely Debugging Tools. This software is an intellectual property of IBH softec GmbH. Our antivirus check shows that this download is malware free.
From the developer:
The S7 Simulation PLC executes a program in the same manner as a hardware PLC. The advantage of executing a PLC program this way is, that the PLC status can be displayed in real time without any recompile activities. Since the Soft PLC behaves like a original SIMATIC® PLC, the programming tools S7 for Windows® and STEP®7 can be used.
You may want to check out more software, such as USMT 4 MigRecover, Vutog GPS Simulator or PowerGUI Pro, which might be similar to S7-Simulation.