An alternate set of Life rules similar to Conway's, but with the additional rule that six neighbors generate a birth. Most of the interest in this variant is due to the presence of a so-called replicator.
See also HexLife, Life
References
Hensel, A. ``A Brief Illustrated Glossary of Terms in Conway's Game of Life.''
http://www.cs.jhu.edu/~callahan/glossary.html.