Journalism & Public Relations

Sports Reference: Free basic stats and advanced analytics

• Baseball
• Basketball
• Pro Football
• Hockey
• College Football
• College Basketball
• Soccer

Professional League Statistics

• NFL player and team stats
• NFL NextGen player and team data
• NBA player and team stats
• NHL player and team stats
• MLB stats
• MLS stats
• PGA Stats
• LPGA Stats
• WNBA Stats

NCAA Stats

• Background information
• Records books
• Championship Summaries
• Current Stats

Other Sport Statistics Sources (mix of free and paid sources)

• Fangraphs for advanced baseball metrics.
• Pro Football Focus for advanced NFL metrics.
• DKPittsburgh Sports one of the first local sites
• Boston Sports Journal 
• The Athletic owned by the New York Times 
• Rivals college sports
• Sports statistics guide from Northern Arizona University

Capology salary database (soccer)

Over The Cap (NFL)

Baseball Savant