This is dynamic, so users can change parameters and the execution schedule of various parts of the code during runtime. Users steer computations via http requests. Output streams from running applications can be displayed as jpegs. Cactus was initially developed to support work on large-scale problems in computational numerical relativity. A number of specialized thorns are available for solving boundary value and time evolution problems on three-dimensional Cartesian grids.
Interested developers can create their own custom thorns.