 If you liked
Steins;Gate
|
 ...then you might like
Houkago no Pleiades (TV)
|
Both titles are toying with the concept that there are various timelines of the present, which converge at points in the past. By changing the events at the junction points in the past, the present can be changed to another timeline.
(For more elaborate explanations of the "many-worlds interpretation", you may check out the comic Murasakiiro no Qualia)