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Organic Chemistry etext provides educational lessons, courses, tutorials, or study material for self-learning.

OSSU Math is a GitHub repository or organization with source code, releases, documentation, or project resources.

Find data collections, study records and related research documentation.

Oxford English Dictionary helps learn languages with dictionaries, reading tools, lessons, pronunciation, or study resources.

Research data portal for exploring empirical social records, including datasets.

Browse research datasets and survey data related to economics.

ParkMath is an educational resource for learning science, history, language, geography, or general knowledge.

Pedro's Pixel Art Tutorials provides educational lessons, courses, tutorials, or study material for self-learning.

PhotoshopTutorials.ws provides educational lessons, courses, tutorials, or study material for self-learning.

Physics Simulations is an educational resource for learning science, history, language, geography, or general knowledge.

PlanetMath is an educational resource for learning science, history, language, geography, or general knowledge.

Moving-image archive from Prelinger Archives, with preserved film and television material for browsing and study.

Non-profit volunteer project and research center for the study of ego documents.

PT-BR is a GitHub repository or organization with source code, releases, documentation, or project resources.

Reddit language-learning wiki with study tools, courses, dictionaries, and community resources.

RAND study of illicit online markets and the operational lessons they present for public policy.

Rekhta Dictionary helps learn languages with dictionaries, reading tools, lessons, pronunciation, or study resources.

RetroFlix

retroflix.org

Moving-image archive from RetroFlix, with preserved film and television material for browsing and study.

ReverseDictionary helps learn languages with dictionaries, reading tools, lessons, pronunciation, or study resources.

Revised Dictionary helps learn languages with dictionaries, reading tools, lessons, pronunciation, or study resources.

Rt911 is a GitHub repository or organization with source code, releases, documentation, or project resources.

Saylor Academy provides educational lessons, courses, tutorials, or study material for self-learning.

SchoolYourself provides educational lessons, courses, tutorials, or study material for self-learning.

Science Geek is an educational resource for learning science, history, language, geography, or general knowledge.