American Baseball Coaches Association (ABCA)
   A nonprofit organization having more than 5,000 members, including coaches from every state in the country and over 200 international members.
   http://www.abca.org/

Major League Baseball Players Alumni Association
   Organization of former players. Features information, history, and news of the organization's activities.
   http://www.mlb.com/mlb/features/alumni/index.html

The United States Amateur Baseball Association.
   The USABA is here for the promotion and development of the players and fans in youth baseball pastseason tournament competitions at state, regional, and national level.
   http://www.usaba.com/