Mutt
Mailspring
Geary
The Bat
Mu4e
Nextcloud Mail
Discourse
Trojitá
Asgaros Forum
Vanilla Forums
Forumbee
Discourse
PunBB
phpBB
XenForo
jforum
Mutt Asgaros ForumBased on our record, Asgaros Forum seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Why not? https://wordpress.org/plugins/asgaros-forum/. Source: about 2 years ago
Asgaros Forum does kinda what you're looking for: I setup Categories (Genre) and then in each was able to setup a Topic (forum) and then a sub-topic (chapter). This is what my layout looks like (quick messy setup). Source: about 2 years ago
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.
Geary - Geary is an email application built for GNOME 3.
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The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.