Also related: Do "map-editor" questions belong here?
(Both from 2010)
I recently reviewed a burst of flagged questions around the hammer tag, with the close reason of game development. Considering the nature of these questions, I agreed and added my vote to close.
Giving it a second thought and reviewing the above two threads, I wanted to resurface this conversation around modding tools for games. Do we consider these "game development" in that sense, or are they on-topic? Where do we draw the line?