Rocketgraph - Rocketgraph is an open-source drop in replacement to Firebase, except it's much better.

Steam Charts - An ongoing analysis of Steam's concurrent players.

Discover on Demand - Just like Spotify's Discover Weekly, but whenever you want.

Steam Database - This tool was made to give better insight into the applications that Steam has in its absolutely huge database.

Muru Music - Personalised playlists within seconds.

Steam Spy - Steam Spy is Steam stats service based on Web API provided by Valve and cool idea of Kyle Orland...