By Matt Pepin, Globe Staff

An app that lets you buy some good karma for your baseball team and an interactive that shows you what a player is worth based on the price of hot dogs at his home stadium were among the creations at Boston Baseball Hack Day held over the weekend at the Globe's headquarters.

"Rally Cry," created by Kenji Ross, John Hamilton, Mike Paulo and Doug Pfeffer, was designed to capitalize on those times when you truly believe you can affect the outcome of a game. You know what we mean -- like when you believe the Sox will win if you watch the game while wearing your favorite Snuggie.

"Rally Cry" lets you put your money where your superstition is by allowing you to pledge a charity contribution in exchange for some cosmic consideration. As in "Dear God, I'll give the Jimmy Fund $20 if Gonzo belts one out now to win it."

That app was the winning creation at hack day, attended by more than 30 computer programmers and web developers and organized by the Globe's Daigo Fujiwara and Matt Carroll. Other projects included a baseball literature review web site, an information graphic that sorts players by uniform number, a database of Red Sox players based on a modified wins above replacement statistic, and a fun interactive that shows a player's value based on the price of hot dogs at his home stadium.

The judges were Boston University and Tufts professor Andy Andres, Ben Fry, principal at Fathom, a Boston-based design and software consultancy, and yours truly.