The tool is your fellow users; just ask here, and use the site-recommendation tag. (Until we come up with a better tag.)
In response to Alan's comment:
We are definitely quick to close/migrate here, and I know the default comment that gets inserted isn't exactly worded in the friendliest way possible. That said, I fully support aggressive closure/migration, because everyone benefits when related information is tied together. If the OP looks like a new user, some of us leave courtesy comments explaining what's happening, and why, and that it's not a negative thing.
As for a "not sure where to post?" link that points here: I think that's unnecessary. If you ask the question on a "regular" site, and you don't pick the site completely at random from all SE sites, it has a decent chance of being in the right place. On MSO, it's almost certainly not in the right place, and migrating things out of here is hard.
I hope that addresses your concern, I'm not 100% sure I understood your intent. Feel free to leave another comment if it doesn't.