What software is this forum using?

Is it open source? If so, what is the name? I’d like to use something like this on our site. Thanks.

It uses one of the most popular OSS forums available:

It’s OSS and they also offer hosting, but we’re just hosting a local copy ourselves, which is very easy with their Docker image.

You can find alternative cheap hosting options at:

Very cool! I really like the way it works. So simple yet effective.