Raw is a pretty cool (and free!) online tool for creating vector outputs of uncommon visualizations. You copy and paste your data, select a few options, and it cranks out the visualization. What’s so nice is that it doesn’t stop there – you can then save it in svg output, and then take that into Illustrator or other vector editing software for finishing touches. It’s nice to see free tools that understand that some users need professional quality outputs. Of course, you can also just download a PNG version and throw it up on the web if you want. 

The speed at which it generates the charts is also pretty impressive considering the complexities.

Treemaps with adjustable colors, size, etc:

Alluvial charts:

Dendrograms:

Circular dendrograms:

Scatter, bubble, and packed circle charts:

and Binned hexagons: