A major enhancement of Madagascar is the recent addition of IWAVE, a wave modeling package from Bill Symes and The Rice Inversion Project (TRIP). IWAVE includes includes a variable-density acoustics modeling application, and the initial release of an isotropic elastic modeling code, both with PML boundary conditions, parallelization over loops and tasks, and other features. Its authors are Igor S. Terentyev, Tatyana Vdovina, William W. Symes, Xin Wang, and Dong Sun. IWAVE was used as a benchmarking and QC tool by SEAM, the SEG modeling project.
You can see a simple example of using IWAVE with Madagascar in this reproducible paper.