[nilkn]

Try producthunt.com. It doesn't quite have the popularity of HN but the flip-side is there's a higher chance of visibility.

[cschmidt]

I joined up, but submitting seems to be invite only at the moment.

[dshanahan]

What's your startup?

[Noelkd]

He posted a show HN[1]. You can check peoples submissions from their profile.

[1] https://www.predictobot.com/