Extensions

Extension Manager

NameDocsDescription

Admin
Allows admins to modify & set custom <head> content
Recount / Rename / Etc

Feature
Rough forum extension
Allow users to create groups of images and order them.
Allow users to make comments on images
Show a list of uploaded posts
A simple wiki, for those who don't want the hugeness of mediawiki

File Handling
Handle JPEG, PNG, GIF, WEBP, etc files
Allows people to replace files for existing posts
This extension allows admins to resize images.
Allows admins to automatically and manually transcode images.

General
Edit the alias list
Adds autocomplete to search & tagging.
Turns BBCode into HTML
Allow users to favorite images
Allow users to filter out tags.
Show various forms of link to each image, for copy & paste
Show various bits of system information

Metadata
Allow images to have metadata locked
Allow images to have owners assigned to them
Allow users to rate images "safe", "questionable" or "explicit"
Allow posts to have relationships (parent/child).
Allow images to have sources assigned to them
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

Moderation
Adds an approval step to the upload/import process.
For stopping spam and other comment abuse
Ban IP addresses
Ban images based on their hash
Report posts as dupes/illegal/etc
Allows the admin to set min / max image dimensions
Keep a record of source changes, and allows you to revert changes.