What is spitzy?

Spitzy is this cute pomeranian. Spitzy reads backwards as yztips, which translates into:

Your Zappy-Tappy Initial and boundary value Partial (and ordinary) differential equation Solver

Now, spitzy is also a growing collection of numerical methods for differential equations, written in pure Ruby. To my knowledge, apart from an interface with the DASPK Fortran library, there currently does not exist another differential equation solver gem for Ruby.