The Free Dictionary
The Free Dictionary is the world's most comprehensive free online dictionary, thesaurus, and encyclopedia, offering synonyms, definitions, idioms, abbreviations, and specialized dictionaries for medical, financial, and legal terms.
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VisionScience
VisionScience.com is an online resource dedicated to the field of vision science, providing information on human and animal vision, visual perception, color vision, motion perception, and related topics.
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Therapistaid
Therapist Aid offers free therapy worksheets, tools, and guides to support mental health professionals and their clients.
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Google Scholar
Google Scholar is a freely accessible search engine that indexes the full text or metadata of scholarly literature across various formats such as books, articles, theses, and patents.