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.
PlusOutils
Therapistaid
Therapist Aid offers free therapy worksheets, tools, and guides to support mental health professionals and their clients.
Statology.org
Statology is a website that makes learning statistics easy by explaining topics in simple and straightforward ways. It offers a wide range of resources, including statistics tutorials, machine learning tutorials, online calculators, distribution tables, Excel guides, R guides, Python guides, Google Sheets guides, SPSS guides, Stata guides, and TI-84 guides.
lab.js – online research made easy
lab.js is a free, open-source online study builder for the behavioral and cognitive sciences, designed to make online research accessible and efficient.