Protovis - A visualization toolkit for JavaScript using SVG.

I've used protovis for an internal graphing framework. It's absolutely, positively, 100% the best visualization tool for the web.<p>The syntax is easy to work with (once you get over the initial learning curve, which is somewhat steep), and it flies on a modern browser. It's the only framework out there for visualization development that's flexible enough to do interesting things with.<p>I think the only other comparable tool is processing (not processingjs, which is too slow for non-trivial tasks), although processing is focused on pixel manipulation whereas protovis is focused on vector drawing.

Protovis is one of the most interesting pieces of code I have looked at recently. It really opened my eyes up to the power of javascript and I learned a lot from it. The code is clean, well documented, and imo brilliant.

I am not even surprised this is cool - Jeff Heer is behind it <a href="http://hci.stanford.edu/jheer/" rel="nofollow">http://hci.stanford.edu/jheer/</a> and he's written some crazy cool frameworks - Prefuse (Java) and Flare (AS3). I'm setting my gitHub watch on this one :-)

you guys might also dig the author's next opensource JS project, polymaps: <a href="http://polymaps.org" rel="nofollow">http://polymaps.org</a>

Anyone know what other similar libraries there are?

Doesn't work in IE6/IE7.<p>Raphaël does.

Here's a better site for checking out some demos: <a href="http://vis.stanford.edu/protovis/" rel="nofollow">http://vis.stanford.edu/protovis/</a><p>This vis library looks really interesting to me because of its flexibility. My main concern is that it's based on SVG. I wonder how easily it could be modified to be canvas based instead. The only reason I say that is because canvas seems to be getting a lot of attention from browser vendors while SVG is languishing...