This fonts are authors' property, and are either shareware, demo versions or public domain. The licence mentioned above the download button is just an indication. Please look at the readme-files in the archives or check the indicated author's website for details, and contact him if in doubt. If no author/licence is indicated that's because we don't have information, that doesn't mean it's free.
Experimental mosaic. . . or maybe a new mineral species? This one achieves a new visual effect at almost every size up to the original. Also try slowly moving the zoom slider for some interesting animations! This font is now nearly 1MB in size! I guess it has to do with the intrinsic complexity of circles.