https://larsjung.de/fracs/
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jQuery.fracs determines some fractions for an HTML element (visible fraction, fraction of the viewport, ...) and also provides the coordinates of these areas. As a bonus there is a page outline feature as seen on the right.
HTML 5 canvas - the basics - Opera Developer Community
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http://dev.opera.com/articles/view/html-5-canvas-the-basics/
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The Opera developer center presents the main principles of the new HTML5 canvas tag, that Opera particularly uses in its widget system : very complete and interesting. Check the demos at the end of the article, it's worth a look!
typeface.js -- Rendering text with Javascript, <canvas>, and VML
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http://typeface.neocracy.org/
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Typeface is a js library that permits to render text in custom fonts without using flash or images. Else, it uses canvas, VML or SVG.
It has the disadvantage of not allowing to select the text for copy-pasting (while siFr allows it).
Firefox, Safari and Opera 9 support the canvas tag to allow 2D command-based drawing. ExplorerCanvas brings the same functionality to Internet Explorer.
https://www.azarask.in/projects/algorithm-ink/
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Algorithm Ink is a port and extension of Context Free by Aza Raskin. The original grammar was originally conceived of by Chris Coyne. Algorithm Ink uses open-web, standards-based tools: no plugins required. You can even right-click to save the drawings. The caveat is that Firefox 3, and Opera 9.5 are the only browsers to fully support Canvas, so it may run slower on Safari, and not at all in Internet Explorer.