Hover Zoom - Enlarge thumbnails on mouse over.
Reddit List - Tracking the top 5000 subreddits
Image Max URL - Help find larger or original versions of images, including a customizable image popup feature
Reddit Check - A tool to check if a URL is on Reddit and going viral
Hover Zoom+ - Google Chrome extension for zooming images on mouse hover - extesy/hoverzoom
Orangered - A daily summary of your favorite subreddits