This question (Are there any gltf example datasets available?) asks about some downloadable models in a specific format. Do we consider questions asking for off-site resources on-topic?
Other sites commonly have a close vote reason like
Questions asking us to recommend or find a book, tool, software, tutorial or other off-site resource are off-topic for Startups as they tend to attract opinionated answers and spam. Instead, describe your problem or need and the steps, if any, you've taken to solve it.
(Stolen from Startups SE. But also similar on Stack Overflow)
Note: Software Recommendations are already in discussion.