speed sim and this are exactly the same
drago-sim.com/index.php?lang=english
only speed sim is a wersion you download which i don't c a point in because if you don't have internet than you can't play ogame so it makes no difference it might be a little bit faster in generating battle simulations but this online wersion is fast as well,
Generaly it's an ogame tool made to simulate fake batles , where you type in your ogame inflo like all of your flete/defences and technologies and then you type in your oponents details or the guy/girl that you wont to attack in the defender fields an then you click simulate and you'll get a simulation where the results are explained in details , like you will c how many ships you would lose and how many resources you'd steel from that player , an all rosts of other thing , the more information you have to type in the dragosim the better , then it makes more realistic simulation i mean closer to what would happen if you attacked that player, another good use of dragosim is tht you can if you don't have enaugh flete to destroy the player you can just for the fun of it test out and type in fake info and you'll be able to caculate exactly how many of witch ships you will need, hope it helped