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Pattern Blocks are used in early math and just for fun. Great for drawing mandalas, tilings, and tesselations. Originally written as a toy for my daughter in 1998, this is my most popular app by a landslide. Latest version features full-browser resizing, better email, hundreds of backgrounds, and keystroke shortcuts. Now with Art Gallery for kid-safe sharing!

Mandalar is PatternBlocks for mobile! PatternBlocks is now released as a mobile app. See Mandalar. Still in Adobe Flex - all web/mobile platforms are cross-operable.

Calligraphy is quite popular. I wrote the original 1997 Java applet as a throwaway programming example - but people kept using it. So I turned it into a real product. Latest version features textured and tinted papers, transparent inks, zoom, print options, Undo support, marker as well as chisel nib, etc.

Calligraphy is now available in Slovene! Translation by Milan Ozimek.

Fractal Music Composer is a powerful music editor. Students build their own musical phrases out of notes from their choice of multiple keys and musical scales. Compositions are built from notes and phrases playing on assorted instruments. Fractal editing operations create self-similar sequences across different time and sound scales. Students can save MIDI output of their creations, which can play their music on almost any computer.

Click to listen to a sample composition made by applying fractal operations on two phrases from Pachelbel's Canon.

Woods simulates northeastern U.S. forest growth with 3 tree species. Features disruptions (hurricanes, deer grazing, fires, etc.), landscape fragmentation, and mixed site quality. Based loosely on Sortie. Woods is primarily a teaching simulator, used at several universities. At Yale, it's used to teach Landscape Ecology.