mag 3d inversion suggestions?

I was hoping to get peoples input on available open source 3d magnetic
inversion routines.

I'm working on a surface wave inversion (ambient seismic noise)
problem, but am interested in incorporating an available magnetic
dataset - and doing a simaluteanous joint inversion (SJI).

I'm familiar with MAG3D (UBC), and have heard of GRMAG3D (CEMI), but
don't know any beyond that. I'm looking for something freely available
to academia, and open source (so I can modify optimization constraints
- fortran/c/matlab).

Any suggestions?

(I'd like to know whats available before I decide to sit down and write my own)

-ashton

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