The C++ code GALCONDA (GALactic CONversion of Dark-matter Axions) is to compute the oscillation probability of photons into axion-like particles (and viceversa) in the Milky Way magnetic field.

It is constantly under development, an example of usage has been presented here:

• Payez, Evoli, Fischer, Giannotti, Mirizzi, and Ringwald, 2015, JCAP, eid 006, Issue 02
• Horns, Maccione, Meyer, Mirizzi, Montanino, and Roncadelli, 2012, PRD, vol. 86, Issue 7