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iCivics provides educational resources and activities about civics for classroom use.

On This Day presents historical events, birthdays, deaths, photographs, and notable people for dates across history.

Killed by Mozilla lists discontinued Mozilla products and services, with dates and product details.

Mission US offers researched educational media for middle school history learning, designed for classroom and independent use.

This page documents Inuit mythology and traditional stories, with material presented in Inuktitut.

Seterra offers more than 400 geography map quizzes, with printable materials for educators and mobile play.

History section of the Humanities LibreTexts bookshelves organizing materials into World History, National History, State and Local History, and Historical Studies.

LibreTexts Social Science collects curated texts for direct use or adaptation into customized learning materials.

The Encyclopedia of the Nations provides country information and material on the United Nations, world leaders, and statistics.

The Basics of Philosophy organizes online learning material by philosophical branch, period, movement, and thinker.

This nLab page gathers material about philosophy, including ontology, logic, and related topics.

WW2 Links collects links and reference material about the Second World War.

The Stanford Encyclopedia of Philosophy provides an online encyclopedia with browse tools, new entries, and chronological archives.

The Logitext interactive tutorial teaches the sequent calculus through a simple set of inference rules.

The U-boat Archive provides documents and photographs about the Battle of the Atlantic.

Pessimists Archive documents historical panics about technology through a timeline and related articles.

A Book of Creatures is a guide to beings from myth, legend, and folklore.

Cost of Living provides cost-of-living data and information about the Numbeo API.

The Retro Web documents computer hardware, with its catalog presented through a web application.

The VGA Museum catalogs video graphics hardware by company and category.

Theoi Project is a reference guide to Greek mythology, exploring gods, spirits, creatures, and heroes through classical literature and art.

rip.so is a digital graveyard memorializing discontinued messengers, social networks, browsers, gadgets and websites.

OilPrice publishes crude oil and gas price charts, futures information, energy news, and investment coverage.

EveryPolitician tracks political office holders, including legislators, judges, and rulers around the world.