I like making simple interactive simulations (often physics related). They are all written in JavaScript, so will run in your browser. If you are interested in making fun visualisations like these, check out this canvas tutorial to start.
Simulations
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Buoyancy
Drop a ball in a fluid and observe the effects of drag, upthrust and the viscosity.
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Fractals
Visualisation of the Mandelbrot set, quadratic Julia sets and polynomial Newton fractals
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Double Pendulum
A simulation of a double pendulum -- a system which exhibits chaotic behaviour
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Electric Field Lines
Visualise electric field lines from multiple point sources
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Sorting Algorithms
Watch how different sorting algorithms work on different data sets
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Snowflakes
Grow a snowflake! A local cellular automata for replicating snowflake growth
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Oscillations
Simulate an oscillating spring with optional damping and a driving force
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Ray Marching
A demonstration of ray marching with basic shapes in a pixel shader. Requires WebGL2 support
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Lenses
Simulate a lens with adjustable properties
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Elastic Pendulum
A simulation of a pendulum with a spring in place of the rod