Andrew Trevorrow
Golly
FreeGolly is an open source, cross-platform application for exploring Conway's Game of Life and many other types of cellular automata.
AndroidGolly
FreeExplore Conway's Game of Life and many other types of cellular automata.
iOSOzTeX
PaidTeX system often used for typesetting mathematics
MacAlchemy
PaidFinds word ladders and creates word lists
MacGolly
FreeSimulator for Conway's game of life.
Mac