Greasy Fork is available in English.
WhatYouSeeIsWhatYouGet preview generator for MangaDex comments/posts/profile. Shows a formatted preview next to the edit box.
当前为
Write your post right the first time!
As one of the more complex bbcode users, I am rather confident this supports everything you normal people want. This can also be run in the browser console if you do not have a userscript manager.
Main bug atm is the interface for the profile page. Still trying to think of a good way to fix that. Main missing feature atm is URL link generation without url tags. IDK why I didn't add that in yet....
Not planned: