I was amazed the first time I used Mathematica. I have used later professionally Maxima to compute some Taylor series and also simpy for some hobby projects. I

I was amazed the first time I used Mathematica. I have used later professionally Maxima to compute some Taylor series and also simpy for some hobby projects. I found simpy less powerful than Maxima (not to mention Mathematica) but the ability to integrate it with the rest of the program is wonderful.