The prediction of accurate source‐to‐receiver travel times and wave paths through heterogeneous media is of major interest in global seismology and microseismic communities. Many algorithms have been proposed to address this problem, among which eikonal solvers have the best accuracy but lack computational efficiency. To facilitate the use of eikonal solvers with a high performance and visualization ability, this article presents a free, open‐source, graphical package named 3DMRT. 3DMRT propagates wavefronts through a 3D heterogeneous medium. Starting with a geologic model, the package first constructs a gridded velocity model. The application implements nine eikonal solvers and provides one‐point and multipoint raytracing functionality. In addition, 3DMRT is complemented with an additional command line tool that allows integration into other programs for further applications.

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