EvanMiller.org became a durable technical notebook for programmers, with practical statistics, A/B testing, ranking algorithms, open-source tools, and essays that kept attracting links for years.
Mcubed.net organizes decades of sports history into team records, streaks, championships, tournament results, rankings, and head-to-head series without hiding the data behind a feed.
John R. Henderson's ICYouSee site went online in 1994 and later published Titanic passenger demographics in the browser, making it an early example of the Web used for historical data exploration.
The old Trenches on the Web casualty table became a widely cited quick reference for World War I mobilization, deaths, wounds and missing or captured troops, while also showing why historical totals need context.