Here's another game I found online at random and thought would be a good fit for this site. It takes the form of a timeline, where you can click a specific event to change its outcome, and by doing so change the course of world history. You only have a few events that can be changed to start with, but things butterfly pretty fast.
It's interesting to click around and see the alternate futures you can come up with, but the game has several major issues. The biggest is that it needs some way to make certain events incompatible with each other, so you don't get something like "1930: Sealand takes over the entire world. All other countries become colonies of Sealand. 1947: The Cold War begins between the US and USSR." I also really wish you could change events that are themselves the results of other changed events. That would lead to more in-depth and interesting gameplay.
It's still kind of fun to see how much you can change, though.