All data is just RSS. Starting a new thread creates a new RSS feed. Replying adds an item to the feed.
No hoops to jump through
I just want to talk, I don’t want to go through registration and e-mail confirmation and logging in each time.
NoNonsense Forum asks you for a name and password when you post. This name and password forms a unique token, protecting the name from other people using it. Every time you want to post, just use the same name and password to keep the same name.