Desperate Gods, by Wolfire Games, is a virtual board game made for Fuck This Jam; you have a bunch of virtually simulated tokens and cards, but you must process and execute the game rules yourself. You can easily cheat, but then what's the point?
DG is not the first game or toolset to do this, although it's certainly the most polished and nicest looking so far. LackeyCCG, for instance, gives you a deck builder, a table, some tools for keeping track of state, then walks away and lets you get to it. The rationale, from their FAQ:
Q: Does LackeyCCG force people to follow a CCG's rules? Will it allow me to do something that isn't legal?
A: LackeyCCG does not implement rules forcing. I have tried other methods of playing CCGs online and I have found that forcing rules adherence just serves to bog down the game and makes it much less fun to play. Lackey allows you to simplify your turn when not much interesting is happen (so you can get to the more fun parts of a game faster). LackeyCCG will allow you to do anything you could do if you were playing with real cards. It also allows for a more formal adherence to the rules if you want to play that way, but it doesn't force any particular play style.