Also the clickhouse dataset, which is free.
Google BigQuery can become very expensive.
https://hacker-news.firebaseio.com/v0/user/whoishiring.json?...
without the googling hoops. Not that this is very helpful after you're done!
On topic: things people can run on their computers or hold in their hands. For hardware, you can post a video or detailed article. For books, a sample chapter is ok.
Off topic: blog posts, sign-up pages, newsletters, lists, and other reading material. Those can't be tried out, so can't be Show HNs. Make a regular submission instead.
Things that can't be Show HN can be perfectly fine regular HN posts, just like this thing already is.
I don't know, 0 posts and two comments, first post with self promotion right away. I had a feeling it's not allowed, oh well
Edit: Maybe I'm figuring it out, is it that you thought that self-posting is strongly discouraged and that 'Show HN' is a label you're supposed to use to identify self-posting? They're not directly related, Show HN is just a special HN category with its own subsection and its own extra rules. Nobody has to use it but if you do use it, the post has to be within those rules. The other, somewhat orthogonal thing is that you can post your own stuff (in or outside Show HN), just don't overdo it.