- American Baseball League (ABL)
 - Features, standings, scores, stats, history, and season calendar. - Century League
- Formed to determine modern baseball's best era. Provides teams, standings, statistics, and news.
- North Carolina APBA Baseball League (NCABL)
- Provides team standings, history, rosters, and more for historical teams.
- RealLeague APBA Computer Simulation League
- Contains results of solo re-plays of 1960's seasons.
- Twentieth Century Baseball Association
- Group of realistic baseball simulation leagues which use the APBA Baseball Computer game and perpetual player ownership.
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