My decision is not very difficult, as I didn't use much modules. Out of those, I chose those that solved exactly what my problem was. Other modules I don't list here might also be very good, it's just that they do something else than my task. The main point in evaluating them is whether I like the interface of the module or not, many modules I used are not here because they failed this criterium.

Thus, here are my favourites:

1. File::Temp
2. XML::Twig
3. LWP
4. Getopt::Long