ENZO with Ambipolar Diffusion

I added ambipolar diffusion into the ENZO MHD code, specifically into the 2nd order Runge-Kutta MHD solver.   The code has been merged into the ENZO codebase and can be found here

https://bitbucket.org/enzo/enzo-dev

ZEUS-MP

I did not have part in writing ZEUS-MP; however, finding a clean version of the code can be difficult, and support is lacking.   The method paper is available on the arXiv, and the source can be found here: