Are you a WordPress user looking to extend the BetterEditor functionality or a developer that wants to build a custom addon/extension for it? Well you are in luck, because the MediumEditor already has over 20 extensions that can easily be integrated into BetterEditor.
Image Upload & embeds
Pavel Linkesch has developed a jQuery plugin to upload images & embed content (from Twitter, Youtube, Vimeo, etc.) following Medium.com functionality. Check it out at http://orthes.github.io/medium-editor-insert-plugin/
Ionică Bizău has created a Medium Editor extension, named Medium Editor Markdown, to add the functionality to render the HTML into Markdown code. Check it out at https://github.com/IonicaBizau/medium-editor-markdown.
A tables support extension is available at https://github.com/yabwe/medium-editor-tables.
Inserting custom HTML
At @jillix, Ionică Bizău developed a Medium Editor extension that allows inserting custom HTML into the editor. Check it out here: https://github.com/jillix/medium-editor-custom-html.
Kasi Chonpimai has created an enhanced placeholder plugin which enables users to add multiple placeholders with specific HTML tags. Check it out here: https://github.com/smiled0g/medium-editor-multi-placeholders-plugin
TCMention for @username or #tags
Tom Chen has built this extension to add mention support that came from Medium 2.0. It also allows users to customize the mention panel for their favor. It’s available on npm and an UMD version as well. Check out the demo and source codes on GitHub.
Auto List Creation
Varun Raj developed an extention that automatically converts ( 1. Space ) to ordered list and ( * Space ) to unordered list if the corresponding base extensions are enabled.https://github.com/varun-raj/medium-editor-autolist