Free online learning tools

Turns a DOI or paper title into a BibTeX entry.

Shows conjugations of Korean verbs across tenses and politeness levels.

Shows tithi, nakshatra and auspicious timings for a day and city.

Lists auspicious muhurat times for events in the Hindu calendar.

Bibliography generator that formats MLA, APA and Chicago citations.

Reads and downloads freely licensed Bible translations in many languages.

Create educational activities such as crosswords and quizzes.

Creates custom worksheets for math, writing and more.

Browser simulator of the Enigma machine with rotor and plugboard settings.

Shows the current ISO week number and lists week start dates for a year.

Shows the Ethiopian calendar date and converts from Gregorian.

Builds a family tree in the browser that you can print or export.

Create and study flashcard decks online.

Spins a wheel or forms groups from a list of names kept in a Google Sheet.

Models fractions with bars and circles to compare and combine them.

Multiple-choice learning game where correct answers fund rice donations.

Learn guitar fretboard note locations by naming notes shown on the strings.

Stretch rubber bands on a pegboard to explore area, perimeter and shapes.

Catalog of the worlds languages with family trees and references.

Free ear training site with interval, scale and chord exercises for building a musical ear.

Calculates GPA from course grades and credit hours.

Shows your current grade and the score you need on an exam to reach a target.

Calculates course grades from assignment scores.

Table converting Gregorian dates to Chinese lunar dates from the Hong Kong Observatory.