Thanks for the Reply :DI really want to thank you for telling me that there is a good Alternative to MatLab :D I will need to use it the next year and haven't find a good alternative until now (mainly because I never used MatLab at all).
As for a Circuit Simulation alternative, I was using KTechLab, it is the best Free Software for this in my opinion, but it is very limited compared to others... Maybe there is some other better alternatives but if so then I don't know them :S..
