Description of the American Federation of Umpires and its services, baseball softball dynamics, links, baseball rules.

Providing high-quality education in the theory and practice of cricket umpiring and scoring

The home of The Rules of Professional Baseball: A Comprehensive Reorganization and Interpretation, a manual and textbook by Chris Jaksa and Rick Roder, and other publications aimed at facilitating the understanding of baseball rules. The manual was developed by instructors at the Joe Brinkman Umpire School over the course of fifteen years, and is the only total rewrite of baseball's rules to exist in the world. The present edition is the seventh, and the site includes access to the first of the Rule Differences Editions, which contains college and high school baseball rule differences. The book is commonly known as the 'Jaksa/Roder' manual by many amateur umpires.

The Boston Amateur Baseball Network is the largest amateur adult baseball league and activity resource in Massachusetts & New England.