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An ophthalmology encyclopedia written by eye specialists

A documentation platform that keeps docs current and readable for AI agents.

Learn and test text patterns with live feedback

Develop mobile illustrations with editable brushes and layered drawing

Animal reference searchable by information and media type

A curated registry of biological and biomedical ontologies

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

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

Bible search with precise control over the books searched

An independent reference for Steam catalogue and activity data

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