National Football League Players Association (NFLPA) - Players' union responsible for collective bargaining. Offers FAQ, union history, information for NFL hopefuls, information for current and retired players, and community programs.
NFL Alumni Headquarters - Official web site of the NFL Alumni. Dues-paying membership association. Anyone who ever played professional football qualifies as a Professional Member. Other individuals may enroll as Associate or Corporate members. The primary criterion for joining the NFL Alumni is a desire to support the charitable goals and activities of the organization.
NFL Canada - League coverage with a Canadian flavor. Profiles of Canadian players in the NFL, history, local NFL events, and information on the NFL/CFL Alliance.
NFL Team History.com - Features, franchise history and records, draft history, rules, and cheerleaders.
NFL.COM - Official site of the National Football League. It delivers in-depth team pages for all clubs, game-day coverage with real time statistics and play-by-play and chats with top players.
RetiredPlayers.Org - Focused on disability and retirement issues for former NFL players.
Wikipedia - Covers the regular season scheduling formula, playoff format, college draft, salary cap, racial policies, television contracts, video games, lore and history, and famous nicknames.