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Professional Football Researchers Association (PFRA)
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History of professional football, including the players, teams, leagues, games and stories from the National Football League (NFL), World Football League (WFL), United States Football League (USFL) and other professional leagues.
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The Helmet Project
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Documents how the helmets for each team of the NFL, NCAA, NAIA, CIS, NFL Europe, Arena football, CFL, as well as defunct professional leagues, have changed over the years, as well as any interesting anecdotes about each.
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Ghosts of the Gridiron
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Information on early professional teams in the Philadelphia area such as the Frankford Yellow Jackets, Pottsville Maroons and Philadelphia Quakers. Team histories, images, schedules, statistics, and period news articles.
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4
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Pro Football Server
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Offers scores and standings for each year in the history of the NFL, the several AFLs, the AAFC, USFL, XFL, WFL, World League of American Football/NFL Europe, Arena and af2, and CFL through 2003. Also offers capsule histories of each league.
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USFL
