Instantly convert any python cli programme made with click into a simple web frontend.
Design is not amazing but it is done in like 30 seconds and you have a frontend.
Wow!

isync/mbsync and offlineimap alternative. Looks pretty good and has a simple enough config!

At the moment unfortunately no way to 'include' things in the config file that I can see,
so no way to implement an externally sourced username/password style.