I am looking for an interactive exploratory tool to embed in a commercial application. I am looking for a commercial-friendly licensed open source alternative to the wonderful Tableau system
Take a look at Pentaho. It's built from open source parts so you should be able to reuse parts of that. There's also R, though that is really more of a statistical programming framework than an ready-to-use exploratory tool.
If you're looking for something that's as easy to use as Tableau though, I'm afraid you won't find any open source solutions.
You can build interactive exploratory visualizations in the browser with D3.
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