Best 'idle' or 'afk' game?

Heh. Good Necro.
I"m kinda on this quest myself.

Currently playing (and enjoying) Crusaders of the Lost Idols (Steam)

I've played and am basically bored or finished with:
Clicker Heroes (lvl 2315) on Steam
Adventure Capitalist (No idea how to describe current level in game) on Steam.

I wouldn't mind some quality recommendations for some other idle games to check out.
Not into anime or overly cutesy.

Are there any new additions to this list? :-)

SimTower. Just sit back and listen to the elevators go up and down.

I've been playing Anti-Idle for years. It's great because you can play with as much or as little interaction as you want. I'll sometimes leave it running in the background for months at a time, and sometimes I'll get really into it and spend a whole day in the various minigames. I play other Idling games fairly frequently, but Anti-Idle is the one that is always on.