Idle Master Extended is described as 'This program will determine which of your Steam games still have Steam Trading Card drops remaining, and will go through each application to simulate you being “in-game” so that cards will drop. It will check periodically to see if the game you’re idling has card drops remaining' and is an app. There are three alternatives to Idle Master Extended for Windows, Linux, Android, Docker and Mac. The best Idle Master Extended alternative is ArchiSteamFarm, which is both free and Open Source. Other great apps like Idle Master Extended are Steam Achievement Manager and Idle Daddy.
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...
Idle Daddy lets you easily unlock your Steam™ Trading Cards using your mobile device. It works by simulating playing the games in your Steam™ library that have trading cards available and waiting for the cards to drop.
only reliable option for card farming outside of windows
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It's an achievement manager, not an actual Gale Idler manager.