Alias Editor Edit the alias list Approval Adds an approval step to the upload/import process. Auto-Tagger Provides several automatic tagging functions Autocomplete Adds autocomplete to search & tagging. BBCode Turns BBCode into HTML Blotter Displays brief updates about whatever you want on every page.
Colors and positioning can be configured to match your site's design.
Development TODO at https://github.com/zshall/shimmie2/issues Browser Search Allows the user to add a browser 'plugin' to search the site with real-time suggestions Bulk Actions Provides query and selection-based bulk action support Comment Word Ban For stopping spam and other comment abuse Cron Uploader Uploads images automatically using Cron Jobs Custom HTML Headers Allows admins to modify & set custom <head> content Danbooru Client API Allow Danbooru apps like Danbooru Uploader for Firefox to communicate with Shimmie Emoticon Filter Lets users use graphical smilies Favorites Allow users to favorite images Featured Post Bring a specific image to the users' attentions Generic Blocks Add HTML to some space (News, Ads, etc) Handle Flash Handle Flash files. Handle Pixel Handle JPEG, PNG, GIF, WEBP, etc files Handle SVG Handle static SVG files. Handle Video Handle FLV, MP4, OGV and WEBM video files. Holiday Theme Use an additional stylesheet on certain holidays IP Ban Ban IP addresses Not A Tag Redirect users to the rules if they use bad tags Post Comments Allow users to make comments on images Post Hash Ban Ban images based on their hash Post List Show a list of uploaded posts Post Ratings Allow users to rate images "safe", "questionable" or "explicit" Post Scores (Numeric) Allow users to score images Post View Counter Tracks & displays how many times a post is viewed Private Messaging Allow users to send messages to eachother Random Post Do things with a random post Regen Thumb Regenerate a thumbnail image Report Posts Report posts as dupes/illegal/etc Resolution Limiter Allows the admin to set min / max image dimensions Rotate Image Allows admins to rotate images. Simple Wiki A simple wiki, for those who don't want the hugeness of mediawiki Source History Keep a record of source changes, and allows you to revert changes. System Info Show various bits of system information Tag Blacklist Adds a tag blacklist to user options Tag Categories Let tags be split into 'categories', like Danbooru's tagging Tag Editor Allow images to have tags assigned to them Tag History Keep a record of tag changes, and allows you to revert changes. Tag Tools Recount / Rename / Etc Transcode Image Allows admins to automatically and manually transcode images. Transcode Video Allows admins to automatically and manually transcode videos. Trash Provides "Trash" or "Recycle Bin"-type functionality, storing deleted images for later recovery User Bios Allow users to write a bit about themselves Word Filter Simple search and replace XML Sitemap Sitemap with caching & advanced priorities 
SoyBooru