Games like Adventure Communist

[Jothki]

There are a lot of idle games out there that are Cookie Clicker clones like Adventure Capitalist, but the multilayer system found in Adventure Communist seems to be much rarer. I have seen one other game like it out there, called Swarm Simulator. It's a much more straightforward game in many ways, so if you'd like to get a better grasp on the basic concepts of the subgenre it might be worth checking out.

Does anyone know of any other similar idle games?

[DarthaNyan]

Derivative clicker
Crank
Clicker Heroes
Crusaders of the Lost Idols

[Jothki]

Clicker heroes (and if I remember correctly Crusaders of the Lost Idols) are members of an entirely different subgenre of idle games, where you use purchases to push as far as you can against an increasingly difficult hard wall, rather than the soft walls of most other idle games.

Derivative clicker seems like a good match to this, though.

[Mr. Fibble]

Some of the layouts or challenges for CotLI can't be idled up as failing a wave means you fail the entire run. It's one of the most active idle games going due to the way you have limits to the number of heroes used and ability to swap them about to build a stronger team.