Hello. I am an experienced C/C++ programmer and I can help you with your project. I know a lot in various fields of knowledge, including, of course, physics and (which is much more important in our case) — numerical methods. For instance, I know how to do your tasks, at least two last ones. For example, harmonic oscillator on w = w0 would have, as far as I know, resonance, and for w != w0 it would not. I'll write all the code in C/C++ and plot everything you need in gnuplot.
However, can you, please, provide first four tasks? I couldn't found them in Internet. If you choose me, can you, please, provide first four exercices as a scanned document or something like?
By the way, price is a subject to change, most likely down (depending on first four tasks).