PureSim Baseball 2007 is a text-based computer baseball simulation published by Matrix Games

Matrix Games

Matrix Games is a publisher of computer games, specifically strategy games and wargames. They are based out of Staten Island, New York.Their focus is primarily but not exclusively on war games and turn-based strategy...

. Originally developed by independent game developer Shaun Sullivan, the first Matrix version was published as PureSim 2005 on 5 October 2005.

PureSim allows creation of a fantasy baseball

Fantasy baseball

Fantasy baseball is a game where participants manage an imaginary roster of real Major League baseball players. The participants compete against one another using those players' real life statistics to score points...

 world made up of either fictional players or real major league

Major League Baseball

Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...

 players imported from the Lahman Database. Leagues, called "associations" in PureSim, can be set up with as few as two teams to as many as fifty. Fully customizable, players may choose cities and nicknames and may even edit cities.

In March of 2009, the game in its entirety was released as freeware

Freeware

Freeware is computer software that is available for use at no cost or for an optional fee, but usually with one or more restricted usage rights. Freeware is in contrast to commercial software, which is typically sold for profit, but might be distributed for a business or commercial purpose in the...

by creator Shaun Sullivan, along with a message on the official website stating that he would like to continue developing the game in its free state.