By default, bbPress is changing all external links in the content to include rel attribute set to ‘nofollow’.
By default, bbPress can use plain textarea or simple toolbar editor, but you can enable TinyMCE too.
By default, bbPress prefixes all forums links (forums, topics, views…) with the ‘forums’ prefix.
bbPress shows Gravatars with all user profile links, and it doesn’t have option to do that from the plugin settings.
By default, bbPress is set to automatically take links and turn them into embedded content.