The 3.0.0001 version of M-209 is provided as a free download on our software library. M209.exe is the default file name to indicate the M-209 installer. The current setup file available for download requires 1.7 MB of hard disk space. Our antivirus analysis shows that this download is virus free. M-209 is included in Education Tools. The most popular versions among the program users are 3.0 and 2.1. The actual developer of the free program is DEFCOM.
From the developer:
This simulator, fully compatible with the original cipher machine, enables realistic operation with rotating wheels, setting of wheel pins and drum lugs, combined with authentic graphics. The program comes with a very complete helpfile, containing the manual, the enciphering procedures from the US military and all technical details on the machine. There's also a picture gallery. Complete with formatted clipboard and Autotyping function.
You may want to check out more software, such as SOUL, Ostberg Fan Selection Program or MaterialWorlds, which might be similar to M-209.