Downloading pChess 2.0 for Mac from our website was free. The actual developer of this free software for Mac is John Roland Penner. The program lies within Games, more precisely Arcade.
From the developer:
pChess is a free chess app for Mac with nice graphics and a built-in FEN Viewer. It supports Fischer games, copy/paste of FEN positions, and SAN Notation. Cool audio and visual brain features let you listen and see as it evaluates moves. Load and save games, with unlimited undo/redo.
You may want to check out more software for Mac, such as Qwak, ArchMage or Gaichu, which might be similar to pChess.