On the Super User SE they have an Off-Topic flag for questions for software and product recommendations:
Questions seeking product, service, or learning material recommendations are off-topic because they become outdated quickly and attract opinion-based answers.
I've seen requests for software recommendations here, and I would be concerned that any answers would suffer the same fallibility.
I'm aware that the learning materials we use rarely become obsolete, and the software is quite static, but things can change, and these questions can still start arguments over preferred solutions.
Should we be including a flag for these, and closing them when they come up?