What is the best graph drawing package for web pages out there? [closed]

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My main concern is not so much flexibility ( of course, that's given like zooming in, etc. ) but the memory leakage. I need something that I can leave on for days and with an every second update - it still needs to go strong.

Flot, JQplot, etc. are all on my radar.

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I've been using Google Charts lately, although that probably doesn't meet your requirement of "every second update" because Google will notice this and most likely impose rate limits on you.