At PokerJuice we have created a set of solid preflop ranges for anybody to use. When doing equity simulations proper preflop ranges are important. The ProPokerTools top x% is a start but we believe that they don't properly reflect the hands good players play.
In our mind they are a little bit too much equity based and playability has not been taken enough into account. Therefore we have created and built-in to PokerJuice a set of preflop ranges that we think are better.
We also realize that for PokerJuice to be as powerful for the user as possible we should make these ranges publicly available for everybody to see and use as they see fit. This also creates a standard from which people can discuss preflop ranges in forums etc.