The recent launch of Path Of Exile's open beta—a new hack & slash action RPG known especially for its enormous skill tree, as you can see in the pic above—inspired us to collect some of the best looking skill and research trees spanning a variety of genres. It's interesting to see how creatively devs can handle this part of a game.
source: Zenon1320's gameplay video
source: Hawken Forums
source: Ascendancy Manual
source: own screenshot
source: The Witcher Wiki
source: Gerald Hopkins' gameplay
Make sure to submit your own picks in the comments below, with visual support.