If your favorite isn't listed - email me at goldenj at gvsu dot edu, or tweet it to @mathhombre.

Essentials:

- GeoGebra
- Desmos
- Wolfram|Alpha
- CoCalc (formerly Sage)

- Jonathan Hall's collection of html5 manipulatives (mathsbot)
- Science vs Magic: Ancient Greek Geometry - Euclid's constructions as a leveled game. I love this. But there's more at the site than this.
- Inspirograph - best online Spirograph tool for making hypo- and epicycloids. And I'm a fool for Spirograph. Competition for this now from wheelof.com/sketch/
- Game About Squares - simple, clever, elegant, devilish puzzles
- Boolean Box - terrific introduction to boolean logic
- John Conway's Game of Life - kind of the archetypal interactive.
- Tiles, brilliant Penrose tiles applet from Science vs Magic.
- Sam Gratrix's ultimate tessellation applet - even into hyperbolic. Loads of abstract algebra connections.

Collections

- Illuminations Interactives
- Malin Christersson
- Math Learning Center apps. All the classics, on web, iOS, Windows, or Chrome.
- Math Toybox (flash)
- Mathenaum. Many applets in number, algebra, geometry, mathart.
- MathMunch's mArTh tools (math+art)
- PhET's simulations. Secondary applets and science applications.
- Simon Fraser University's Dynamic Geometry tools (in Web Sketchpad)
- Thomas Ferguson's Javascript Games - dots & boxes, Nim & variations, and more
- University of Colorado's PHET Simulations
- Freudenthal Institute's Applets (great but in Java)

- Jonathan Hall's collection of html5 manipulatives (mathsbot): Base 10, algebra blocks, Cuisenaire rods, pentominos, fractions, ten frames...
- Didax Manipulatives page: geoboard, pattern blocks, rekenrek, unifix, & more...
- National Library
- Math Learning Center: GeoBoard, Base Ten Blocks, Ten Frames, Number Line, Pattern Blocks...
- Mathsbot has everything
- mathtoybox: Pattern Blocks and number blocks (Cuisenaire rods)
- Nrich: Cuisinaire Rods [Flash]
- Visnos: Fraction Wall (several others at Visual Numbers)

- Sweet fraction visualizer plus number line. 0-1, reminiscent of Cuisinaire rods.
- Scale of the Universe
- Refraction - fraction composition and addition in a clever but challenging laser splitting puzzle.
- 2048 and it's arithmetic sequel Just Get 10
- Numbers Addict - my favorite mobile time killer is now a FB game.
- Solve Me mobiles - nice algebra context
- Slice the Pie - estimate fractions in a circle model. Fraction Fred is from the same folks on this engine.
- The Times collection of online number puzzles. KenKen, Suko and more. New puzzles daily.
- Factorization visualizer

- Touch Trigonometry
- Balance Applet (Illuminations) - expressions, balance and graphing
- All the graph paper

- Recursive Drawing
- Doodal - very organic interface
- GeoKone
- GoogleLab's beautiful HTML viewer for Mandelbrot & Julia sets
- Gorgeous viewer of the Mandelbrot set.

- Entanglement - lovely and engaging, some subtle discrete math going on.
- Nice Neighbors - puzzles that also compute real math problems.
- Havel-Harikimi - Jacopo Notarstefano illustrating a graph theorem from Erdös and Gallai by letting you build the solutions.

Geometry

- KaleidoTile (downloadable) by Jeff Weeks
- Isometric Drawing Tool (NCTM Illuminations)
- Euclid: the game. Well done alternative to Science vs Magic at the top.
- Eyeballing Game - weird little game that hones your estimation.
- Malin Christersson: Hyperbolic Tiling - with your own images
- Pool Practice: billiards interactive that takes into account striking angles and velocity
- Sketchometry - converts hand/mouse drawn lines to geometric objects.
- Circle Packing - a puzzle and a game that come at it from different angles. Circle Packing and Filler
- Z-Rox - identify objects, numbers letters. Trick is, you're in Flatland. You won't play for hours, but so clever. Plus, it gets hard quickly.
- Sam Gratrix polyhedron modeler
- Scissor's Congruence - Brilliant demonstration of the Wallace–Bolyai–Gerwien theorem.
- Brilliant illustration of Scissors Congruence. (Wallace–Bolyai–Gerwien Theorem)
- 4 Color a Dodecahedron - puzzle from Jacopo Notarstefano.

- Excellent visual overview of probability and statistics: Seeing Theory
- Conditional Probability viewer and
- Central Limit Theorem plinkoish experiment. Both from Setosa.
- A different CLT. Love the mean of the samples visualization.
- Excellent Guess the Correlation game.
- Elementary stats data & display with Furbles.
- plot.ly - share and graph data.
- Google public data

- Imaginary: Morenaments - bitpaint in any of the wallpaper groups. [Java]
- Girih Designer - tessellation tool for Islamic designs that has a wide variety of style options.
- Curvetile - Edmund Harris with a cool Truchet vision.
- color: slightly maddening color matching game
- Craig Kaplin's Escher spiral tiling applet. See his Tactile tessellation applet, too.
- Malin Christersson:Mondrian Meets Möbius (circle inversions on primary colors)
- Math is Fun: Spiral Artist, Symmetry Artist and Tessellation Artist
- Kaleidoscope Painter
- Scribbler, Too - why list this on a math blog? Parameters! The kind of choices digital artists have to make involve setting so many parameters and understanding their effects. Plus - cool effect.
- Kubist - samples images to make a Picasso-ish version in triangles or Voronoi cells.
- Koalas to the Max - lots of dots. It only does one thing but is oddly fun.
- Cycloid Maker (Think Spirograph on steroids.)
- Spiralateral Maker (very customizable)
- Shout out: Dan Anderson's Processing Page. So much, so good.

- Game About Squares - great logic puzzler + clever (also an app)
- Figure Ground - Scott Kim's ideas, playing with positive and negative space.
- Puzzle School: Code Puzzles - teach you HTML and Javascript
- Math Resources: Jelly
- Collection of puzzles: Tacoyaki simple rule flipping 2 color counter puzzle [Flash]; part of a large collection
- Loops of Zen: click puzzle [Flash]
- Gridlock -the Classic [Flash]
- Simon Taham's Puzzles: Loopy - constraint puzzle where you construct a path. Elegant, and transferrable to paper.
- Bojagi: divide a grid into rectangles of specific area.
- Make your own! Discovery Education's puzzlemaker includes math squares and number tile puzzles.
- Slanted at BrainBashers, which has many more types of puzzles.

- Boolean Box - terrific introduction to boolean logic
- Eyemaze: Grow - amusing test of logic and experimentation. Maybe this is a puzzle? [Flash]
- Gprime: Animal Maze Maker. My love of this game is inexplicable. [Flash]
- Guardian Rock - Indiana Jones vs the Boulder, and you are the boulder.
- 2048, of course. Solar fusion variation. (H+H=He)
- Agar.io eat or be eaten
- Dots & Boxes. (Score and move again rules)
- Maths Resources games: great collection of classics and new.
- A LaTeX game! TeXnique

- Reddit's r/mathpics

- Twine - choose-your-own-adventure type stories. You'll want philome.la for hosting if you do.
- Voxel - build 3-D images then output 3D printing code or nets to make.
- Mindmup - concept maps

People

- Jeff Week's Topology & Geometry collection
- Julie Wright's Puzzles and Games
- Tracy Johnston Zager's elementary review

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