Fnd - Browse Apple App Store and iTunes on the Web
Battle of the Brands - Compare the online awareness of 2 brands in a battle
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
Retro App Store - How App Store would look like if it was launched in 80s
Knicket App Search - The future Wikipedia for Apps
MacMenuBar - A curated directory of 200+ Mac menu bar apps