GitHyp
Steam Charts
Steam Database
Steam Inventory Helper
Steam Tools Hub
Steam Spy
Augmented Steam
GameAnalytics
Steam Market History Plus
Steam Inventory Helper
Steam Tools Hub
Augmented Steam
Search items between steam friends.
Enhanced Steam
Steam Ninja!
Steam Database
GitHypSteam Charts - An ongoing analysis of Steam's concurrent players.
Steam Inventory Helper - Steam Inventory Helper is a free browser extension for Google Chrome that adds a big amount of new features into the Steam trade-offer system & Steam store functionality.
Steam Database - This tool was made to give better insight into the applications that Steam has in its absolutely huge database.
Steam Tools Hub - A set of Steam related WebApps built around trading cards, emoticons and backgrounds.
Augmented Steam - Enhanced Steam fork by IsThereAnyDeal.
Search items between steam friends. - This browser extension is useful in finding the items for in all steam friends inventories simultaneously.