The Bifrost plug-in for Maya allows you to create custom, reusable effects in a procedural graph-based environment. It features a rich and extendable library of nodes that cover tasks like simulation, scattering, instancing, rigging, and more.
The installation also includes the older Bifrost Fluids and BOSS plug-ins for Maya. These use a menu-based interface that is less flexible and customizable than the graph, but are still supported for compatibility with older scenes.