Free online learning tools

Use area tiles to multiply and factor polynomials visually.

Drag points and see the fitted line, residuals and correlation change.

Add bonds and lone pairs around a central atom to see VSEPR molecular geometry.

Stimulate a neuron and watch ion channels and the membrane potential during an action potential.

Small simulation of particles passing through a double slit and building an interference pattern.

Offers Bible reading plans with daily passages to follow.

Generates APA citations for websites, books and articles.

Animated binary search tree where you insert, find and delete values.

Listen to chords and identify their quality by ear.

Practise naming chords shown on the staff.

Play with sine, square, triangle and sawtooth waves to hear how waveform shape changes sound.

Long interactive article on how a bicycle balances, steers and transmits force.

Interactive essay on how lenses focus light and form images in cameras.

Interactive article explaining gear ratios and tooth shapes with manipulable models.

Interactive article on how light, surfaces and occlusion create shadows.

Interactive article on how sound waves travel, with simulations of air motion.

Makes quizzes, matching games and memory games from your own content.

Game-theory model on a grid that produces shifting colour patterns as strategies compete.

Combines a collective-motion model with the Schelling model to show moving, sorting groups.

Playable simulation of how contact tracing and privacy trade-offs affect an outbreak.

Simulation that lets you test interventions and see how an epidemic could unfold.

Interactive article showing how t-SNE settings change the maps it produces on toy data.

Interactive article on gradient descent momentum with sliders that change the dynamics live.

Interactive 2D transformations to see eigenvectors and eigenvalues.