Idle Daddy VS Steam Achievement Manager

Idle Master - Idle Master is an application that automatically idles your Steam games to extract all your available Steam Trading Cards. The application finds the games you have drops remaining in until all of your trading cards are in your inventory.

Umso - The Website Builder for Startups

ArchiSteamFarm - C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

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

Dotabuff - Dotabuff is the leading statistics and community website for Dota 2

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