Gernot Katzer's Spice Pages document 117 spice plants with culinary use, history, chemistry, etymology, photographs, geography, botany, and more than 10,000 names across dozens of languages.
Mark Rosenfelder's 2000 Zompist spelling page treats English orthography as a system that can be analyzed, modeled, and partly predicted instead of dismissed as random chaos.
Mímir is a surviving hypertext Icelandic grammar notebook that turns parts of speech, examples, and cross-references into a compact old-Web language tool.
StarLing's database server preserves searchable etymological, typological and lexicostatistical datasets through a dense CGI interface built for comparative and historical linguistics.