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Educational tools for examining global facts and assumptions

A multilingual encyclopedia with a language-aware search

Related English words for revising a draft

A versioned taxonomic catalogue of spiders

A historical London map linked to texts and reference records

Metric and imperial conversion with reference charts

Chemical calculations with balancing and molar-mass tools

Find destination tours, attraction tickets and travel experiences

Bible search with precise control over the books searched

An independent reference for Steam catalogue and activity data

Educational collections of historical source texts

A subject-organized reference to Alabama

Regional history connected to Philadelphia's present

English definitions beside usage and collocation references

English dictionary lookup with explicit usage guidance

Discover peer-reviewed open-access books and publishers

Physical constants linked to units and uncertainty guidance

Spectral lines and atomic energy-level reference data

A connected library of Jewish texts and commentaries

Quran reading and listening organized by surah and topic

Minnesota historical entries filterable by topic and era

Oklahoma history searchable by name, era and topic

Population pyramids by place and year

Standardized bacterial information at strain level