Extension Manager

Edit the alias list
Adds autocomplete to search & tagging.
Turns BBCode into HTML
Allow users to favorite images
Handle MP3 files
Handle JPEG, PNG, GIF, WEBP, etc files
Handle static SVG files.
Handle FLV, MP4, OGV and WEBM video files.
Show various forms of link to each image, for copy & paste
Allow users to make comments on images
Show a list of uploaded posts
Allow users to rate images "safe", "questionable" or "explicit"
Allow posts to have relationships (parent/child).
Add titles to media posts
Allows displaying a page with random posts
Regenerate a thumbnail image
Report posts as dupes/illegal/etc
Allows admins to rotate images.
Keep a record of source changes, and allows you to revert changes.
Show various bits of system information
Let tags be split into 'categories', like Danbooru's tagging
Add or remove tags to the editor via clicking.
Allow images to have tags assigned to them
Keep a record of tag changes, and allows you to revert changes.
Recount / Rename / Etc