Apps similar to Idle Master Extended include Steam Game Idler, which is free. Other options are ArchiSteamFarm and Steam Achievement Manager. In total there are three apps like Idle Master Extended for Windows, Linux and Mac.
Enables automated card farming, achievement management, playtime boosting, and inventory sales for several Steam accounts without a local client, including task scheduling, free game notifications, sign-in flexibility, and source code transparency.
Australia
ASF is a C# application with primary purpose of farming Steam cards from multiple accounts simultaneously. Unlike Idle Master which works only for one account at given time, while requiring Steam client running in the background and launching additional processes imitating...
Poland
EU
A manager for game achievements in Steam.
Canada