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.
An experimental 12-segment display, and my 100th published Fontstruction. It's the calculator of yesterday's future!
This one belongs to a small family called Calculatrix. This font is monospaced to ensure segments are always where they "should " be as if the text were printed on one giant display.