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I've been using a similar tool, Type Sample, and I've found it really useful. It has no download function, but I'm confused why that option is available at all with the tool you've posted; it encourages theft, no?
Dave Crossland said:
http://fontface.ninja as a polished visual design and makes it easy to play with web fonts on other websites, and download them.
I figured the community here might like the blacklist request at the bottom of the page