- American Baseball Coaches Association
- Hall of Fame inductees are posted, together with the group's code of ethics, details on open dates, news archives, and publications.
- California Baseball Umpires Association
- Presents bylaws, news, baseball rules, study guide questions, contacts, and information on executive council and history of playoffs.
- Major League Baseball Players Alumni Association
- Organization created to promote the baseball game, raise funds for charity, and inspire and educate the youth through positive sport images.
- Society for American Baseball Research
- Aims to foster the research and dissemination of the history and record of baseball. Undertakes programs that encourage the study of baseball as a significant athletic and social institution, disseminate educational and historical research information, and promote further literary efforts.
- USSSA Baseball
- Baseball section of the United States Specialty Sports Association. Presents news, rules, and information on tournaments, series, and rankings.
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