There's https://www.indiehackers.com https://www.indiehackers.com, which is pretty popular. They have a relatively active forum (even though it could use some w

There's https://www.indiehackers.com https://www.indiehackers.com, which is pretty popular. They have a relatively active forum (even though it could use some work as a lot of good discussions can go unnoticed), plus founder interviews and a good podcast.