I quite liked Stewart's Calculus. http://www.stewartcalculus.com/ http://www.stewartcalculus.com/ And it is really helpful to use some CAS (like Maple, Octave o

I quite liked Stewart's Calculus. http://www.stewartcalculus.com/ http://www.stewartcalculus.com/ And it is really helpful to use some CAS (like Maple, Octave or Maxima) to visualize problems.