Hey,
We were wondering the same thing for our upcoming launch and wanted to soft launch before PH to have feedback and fine-tune things.
This list from SubmitJuice is really well made - https://airtable.com/embed/appKf...
Not all of them are launch communities, but there are some good ones. There are also some other avenues to get visibility and early users.
Hope it helps! :)
G2 accepts launches of products that completed alpha and beta stages i guess, perfect for B2B products. Startup Stash and Betalist are other alternatives.
We also launch our products on various social media platforms like Instagram and Twitter, because who doesn't love a good tech reveal on their feed, am I right?
InrĹŤ