Admin
Downtime		Show a "down for maintenance" page
Holiday Theme		Use an additional stylesheet on certain holidays
Tag Tools		Recount / Rename / Etc
	Feature
Forum		Rough forum extension
Pools		Allow users to create groups of images and order them.
Post Comments		Allow users to make comments on images
Post List		Show a list of uploaded posts
Wiki		A simple wiki, for those who don't want the hugeness of mediawiki
	File Handling
Bulk Add CSV		Bulk add server-side posts with metadata from CSV file
Handle MP3		Handle MP3 files
Handle Pixel		Handle JPEG, PNG, GIF, and similar files
Handle Video		Handle FLV, MP4, OGV and WEBM video files.
Replace File		Allows people to replace files for existing posts
	General
Alias Editor		Edit the alias list
Autocomplete		Adds autocomplete to search & tagging.
BBCode		Turns BBCode into HTML
Bone Quality		Displays a summary page of booru quality metrics.
Favorites		Allow users to favorite images
Filter Tags		Allow users to filter out tags.
Generic Blocks		Add HTML to some space (News, Ads, etc)
Random Post		Do things with a random post
Ratings Blur		Blurs thumbs based on rating, users can override. Requires 'Post Ratings'.
System Info		Show various bits of system information
	Integration
RSS for Comments		Self explanatory
RSS for Posts		Self explanatory
	Metadata
Lock Editor		Allow images to have metadata locked
Notes		Annotate images
Owner Editor		Allow images to have owners assigned to them
Post Ratings		Allow users to rate images "safe", "questionable" or "explicit"
Post Relationships		Allow posts to have relationships (parent/child).
Post Scores (Numeric)		Allow users to score images
Source Editor		Allow images to have sources assigned to them
Tag Categories		Let tags be split into 'categories', like Danbooru's tagging
Tag Editor		Allow images to have tags assigned to them
	Moderation
Block Tag Wipe		For blocking spam and trolls wiping tags.
Bulk Actions		Provides query and selection-based bulk action support
Report Posts		Report posts as dupes/illegal/etc
Source History		Keep a record of source changes, and allows you to revert changes.
Tag History		Keep a record of tag changes, and allows you to revert changes.
Trash		Provides "Trash" or "Recycle Bin"-type functionality, storing deleted images for later recovery
hCaptcha		Adds hCaptcha to various pages.