Came across this neat little program that can help you collect Steam trading cards without even having the games installed. It was made by the guy who created the Enhanced Steam plugin, and it's open source, so you can decide for yourself whether you trust it.
Idle Master will simulate you being "in-game" on Steam for each game in your library with available Trading Card drops, and will automatically move from game to game when each is finished.
Steam Idle Master
Discussion on Reddit



