Hi James, I downloaded the latest release of ChessX (I am running it on Mac OS X) and used it for the first time a few weeks ago and am now a very happy user! It is great to handle the game databases which I downloaded as well as my own games and for analysing. Many thanks!!
ChessX 1.2.2 Released Today
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ChessX is a very nice free open source pgn browser/chess database program which runs on Windows and Macintoshes.
http://chessx.sourceforge.net/node/3