(I thought that we had a similar discussion, but couldn’t find it.)

**Are software identification questions on-topic?**

I.e., questions where the OP is not looking for options/alternatives, but for a specific software. In the usual case, such questions would only have one correct answer.

Here are some questions for discussion:

* Actual examples: 
 * [Wiki software being used by Gnome](https://softwarerecs.stackexchange.com/q/3553/60) (Answer: [MoinMoin](https://softwarerecs.stackexchange.com/a/3556/60))
* Conceivable examples:
 * Which tool does Trinity use in *Matrix Reloaded*? (Answer: [Nmap](http://nmap.org/movies/))
 * Which OS was used to render *Avatar*? (Answer: [Ubuntu](http://en.wikipedia.org/wiki/Avatar_%282009_film%29#Visual_effects))
 * Which tool does Canonical use to build Ubuntu releases?
 * What was the name of the driving game included in Windows 95?
 * Which OS run Deutsche Bahn ticket machines?