• Handle pen and stylus input
  • Create smooth curves
  • Save curves as downloadable image
  • Postfix the simplest math expressions
  • Postfix most math expressions.
  • Deal with parentheses and negative numbers.
  • Trigonometric functions and logarithms.
  • An overview of creating HTML Tables.
  • Learn ways to import data.
  • Add tables to a static HTML file.
  • Sortable tables without any JavaScript.
  • Sort rows and/or columns.
  • Filterable tables without any JavaScript.
  • Import data from a Google Sheets doc.
  • Fully customizable filters.
  • Sudoku puzzles without any JavaScript.
  • Full featured and/or lightweight.
  • Customizable shapes and characters (emojis!).
  • Use Python to convert shapefiles to SVG.
  • Use JavaScript to edit the shapes.
  • Create a server for all-in-one creation.
  • Parse a variety of math syntaxes.
  • Accept Python, JavaScript, and some LaTeX.
  • Create an easy to postfix expression.
  • Use CSS to change colors and compute sums.
  • Create electoral college map.
  • Parse simple LaTeX into postfixable format.
  • Handle derivatives, integrals, matrices, sums, and more.
  • Learn 19 solving techniques.
  • Test your knowledge with examples of each strategy.
  • Fast, lightweight recognition of pen input.
  • Train your own character set.
  • Challenges when creating Fox and Geese with CSS.
  • Create a countdown clock, switch turns, take turns, and more.
  • Play against a tic-tac-toe bot.
  • Convert FEN string to an image.
  • Multiple formats including GIFs for animating moves.
  • Create a web component for easy embedding.
  • A city-building game without JavaScript.
  • Convert 3D .obj files to HTML elements.
  • Zoom, rotate, and move around your city.
  • Track population and view demand maps.
  • Chart, tables, and maps answering many interesting questions.
  • How many people live in various climates?
  • Contours of a given population density.