Baseball Savant
Unknown
MLB's public Statcast site, with searchable pitch-by-pitch data, exit velocity and spin leaderboards, and per-player visualisations. Useful for checking how a hitter or pitcher actually performs rather than relying on traditional box-score statistics.
More resources on Baseball
baseball-reference.com
Baseball-Reference.com is a comprehensive baseball statistics database with detailed player, team, and league stats, game logs, season summaries, and historical records, plus bios and advanced metrics.
fangraphs.com
FanGraphs is a comprehensive baseball analytics site offering advanced stats, projections, and leaderboards, along with in-depth articles and detailed player and team pages.
Driveline Baseball
Training company whose site publishes research, blog articles, and program breakdowns on pitching velocity, hitting mechanics, and arm care, much of it built on motion-capture and bat-sensor data. Sells paid programs alongside the free writing.
Effectively Wild
Ben Lindbergh (The Ringer), Meg Rowley (FanGraphs), and an array of guests talk about baseball with an analytical bent, covering a mix of timely topics from the serious to the absurd a few times per week.
Moneyball
Account of the 2002 Oakland Athletics and general manager Billy Beane, who used undervalued statistics such as on-base percentage to compete against far richer clubs. Explains why sabermetric thinking spread through professional baseball front offices.
The Baseball Codes
Reported account of baseball's unwritten rules: retaliation pitches, bat flips, stealing signs, running up the score, drawn from player interviews. Explains why certain plays provoke fights that box scores never record.