Reddit Metis - show stats and analysis of a given reddit user
Uforio - Uforio is an alternative client for Reddit.
FrontPageMetrics - Daily updated statistics for every subreddit on Reddit. Top subreddits, new subreddits by date, all subreddits, trending subreddits, plus more Reddit stats
RedReader - RedReader - An unofficial open source Reddit client for Android.
Subreddit Stats - Statistics for every subreddit.
narwhal - Narwhal is a simple iOS app for reddit.