Stormvn 3D-CGi shares a rock Generator Compound for Bifrost in Maya.

Procedural workflows lend themselves well to generating things like terrain and rocks, among other things. This new rock generator compound from HyUU creates randomized rock shapes from any primitive using Bifrost in Maya.

HyUU (now Stormvn 3D-CGi) has been doing a lot of stuff with meshes in Bifrost. You can get a suite of Mesh-Editing tools for Bifrost, including cut mesh, scatter mesh, extrude mesh, copy geo to points, reduce mesh, merge vertices, and a Catmull-Clark subdivision node. Visit the page for Hyuu Bifrost Mesh Compounds here.