Subreddit Stats - Statistics for every subreddit.
RedReader - RedReader - An unofficial open source Reddit client for Android.
RedStatz.com - Reddit Website Statistics
Subdood - Browse reddit in clear view of your boss and the creepy guy staring at you right now
FrontPageMetrics - Daily updated statistics for every subreddit on Reddit. Top subreddits, new subreddits by date, all subreddits, trending subreddits, plus more Reddit stats
3D for Reddit - Browse Reddit in 3D right in your browser.