Downvoters: I'm explaining why I think it was closed, not saying it should have been closed (I agree with Anna). If you disagree with my reasoning you really need to also post a new answer explaining, just saying "nope" is not helpful for OP.
From the same FAQ:
Please note, however, that site policies prohibit questions of the following types:
- Game and Mod Development (try the Game Development Stack Exchange instead)
- Requests for game identification based on personal recollection alone
- Catalogues (listing games that fit specific criteria or are like an existing game)
- Shopping advice and recommendations
"Shopping advice" on SE covers "Is there a product for X?" style questions. One of the problems with this subset in particular is that the answers become a (potentially unbounded) itemized list, with each answer being one product, often with little explanation. Votes tend to become about popularity instead of how well they answer the question.
In your question, I don't see any indication why you need an "app" or to use the command line. Asking for a product
Y to do
X instead of asking how to do
X directly is known as The XY Problem, and is frowned upon because it precludes non-Y solutions that may in fact be way better suited to your needs. Since you're asking the question you presumably do not have the knowledge required to determine what types of answers you should get!
Fortunately the "X" is clear from your post, unlike many XY questions. So take the Y away, and the core of your question (as Anna hints at below) is:
How can I generate chunks for Minecraft maps?
Which is a great question for this site. If you do need to use the command line, please explain why in your question, but use the "How can I?" format for best results.