I have published seven books on applied mathematics. You should find the one entitled "Living Math" interesting. "Monte Carlo Simulation" is the most popular. You can download the eBooks for free from Amazon on certain dates, otherwise it's $0.99/ea. The free dates for each book are listed above the cover picture and the link to Amazon is below each one http://djamesbenton.altervista.org/index.html There's a preview feature on Amazon (look inside) so you can see what they're like before downloading. If the format isn't compatible with your device, Amazon has apps you can download and read on most any smart device. There's software to go with each book. It's all free. The software is at http://dudleybenton.altervista.org/software/index.html
The greatest handbook of all time is available free at http://people.math.sfu.ca/~cbm/aands/abramowitz_and_stegun.pdf Every mathematician must have a copy!