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A versioned taxonomic catalogue of spiders

A historical London map linked to texts and reference records

Math and electrical calculations in a compact tool directory

Metric and imperial conversion with reference charts

Chemical calculations with balancing and molar-mass tools

Find destination tours, attraction tickets and travel experiences

Scholarly search with author, publication and date controls

Structural language properties in a comparative database

Bible search with precise control over the books searched

Historical maps with text search and geographic viewing tools

An independent reference for Steam catalogue and activity data

AI music generator with free signup and paid plans.

Educational collections of historical source texts

Alberta health references, patient handouts and service information

A configurable vault for credentials and reference data

English definitions beside usage and collocation references

English dictionary lookup with explicit usage guidance

Discover peer-reviewed open-access books and publishers

Discover linked publications, datasets and research software

Spectral lines and atomic energy-level reference data

Quran reading and listening organized by surah and topic

Cleveland historical articles with a multimedia search

Population pyramids by place and year

Standardized bacterial information at strain level