PubChem
pubchem.ncbi.nlm.nih.govChemical structures, substances and bioassay information
Chemical structures, substances and bioassay information
Detailed bird life histories with maps and multimedia
Open textbooks for higher-education subjects
Curated learning-resource discovery by discipline
Guides for international and foreign legal research
Academic phrasing organized by rhetorical purpose
Anatomy articles, diagrams and three-dimensional learning material
An ophthalmology encyclopedia written by eye specialists
Learn and test text patterns with live feedback
Develop mobile illustrations with editable brushes and layered drawing
A curated registry of biological and biomedical ontologies
Controlled terminology for art and cultural-heritage research
Educational tools for examining global facts and assumptions
Shakespeare texts with scholarly and educational context
A multilingual encyclopedia with a language-aware search
Related English words for revising a draft
A versioned taxonomic catalogue of spiders
Math and electrical calculations in a compact tool directory
Scholarly search with author, publication and date controls
Structural language properties in a comparative database
Bible search with precise control over the books searched