- Pony Baseball and Softball - Official site includes affiliated members links, news, calendar, tournaments, and World Series coverage.
- Official Communications - Offers baseball rules and officiating videotapes. Features online shopping and video previews.
- Major League Baseball: Official Rules - Complete rules of major league baseball, with diagrams and glossary.
- Interactive Baseball Rules - Seeks to create a fun environment for baseball umpires, players, coaches and fans to enhance their understanding of the rules of the game. Offers online quiz, along with rules/officiating resources.
- Jim's Baseball Rules - Little League - Provides a myriad of baseball rules and regulations, FAQs, umpiring tips, myths and links. Gathered by a certified Little League umpire and former Chief Umpire for California District 3.
- Baseball Umpires Rules and Interpertation - Major League Baseball rules, interpertations, questions and answers, newsletter, do's and don't on the playing field
- Baseball and Umpire Links - Link directory of baseball rules and umpiring resources.