Facebook Gaming - Watch and stream live games on Facebook
Steam Charts - An ongoing analysis of Steam's concurrent players.
Watch People Code - Livestreams of people coding
Steam Database - This tool was made to give better insight into the applications that Steam has in its absolutely huge database.
Twitch Creative - Watch artists create. Twitch expands into the arts.
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.