There's a very incomplete list at https://news.ycombinator.com/invited - incomplete because it only includes posts that technically got an invitation link by email, but there are plenty of others. You can also look at https://news.ycombinator.com/pool (explained at https://news.ycombinator.com/item?id=26998308) and find Show HNs in there. But that list includes many Show HNs that we didn't specifically help with beforehand.

(So I guess you can have either a list of too many or a list of too few )

p.s. If anyone notices really cool work that would be even better if the creator did a Show HN, please let us know at [email protected].