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Get flash to fully experience Pearltrees
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jar

http://bluff.jcoglan.com/ To draw a graph, you create a new Bluff graph object using the id of a canvas element on the page, set some options, add the data and labels, then tell the graph to draw. A basic example:

Bluff: Beautiful graphs in JavaScript

Using free software for HTTP load testing

If you leave out the load-testing packages that are no longer maintained, non-free, or fail the installation process in some obscure way, you are left with five candidates: curl-loader, httperf, Siege, Tsung, and Apache JMeter. http://archive09.linux.com/feature/143896
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