Pyps Tycoon is a unique business sim which places a heavy emphasis on in game stock trading.  All companies are publicly traded and tracked.  This means you can develop your wealth without ever having to work a bit.  Simply invest wisely and profit.  They also provide, through events all sorts of bonuses to help players advance, like +20% income and +100 points productivity for days worked.  If you play purely for free you will have to log in for a bit to collect enough free bonus to get your first productivity item but it is worth it.  Pips Tycoon was recently overhauled by a new development team in November of 2016.