Seeing as my "Create posts from RSS feeds" has proven to be very popular, I am also looking to share something that works in a similar way, but uses email. Essentially, you email your post to a mailbox of your choice. The script then parses this email message, and uses the subject and body to create a post using the Flarum API.
This is a lesser used method, but I decided to write it anyway as (oddly) I had a need for it.
If there's interest in this, I'll willingly post it
