Zandronum

Here's where i got it:
http://www.jspenguin.org/software/listacs/

Yes, they have a read me txt there but it doesn't say anything about how to do it properly. It does has the commands but doesn't say anything about where to put it.

You have to use a Batch file or Command prompt. I used this for automatically dumping a BEHAVIOR.lmp into a decompiled.txt. Keep in mind that some ACS commands cause no scripts to be displayed, only the strings. That is because the commands are newer than the version of ListACS itself. Take cavbld.wad for example. You can't view the scripts, nor try to decompile them. All you get are obfuscated strings, but that is what he did to pass the filter. Sneaky, I know.