About Celestia Medium font
This is Purple Tinker's font that was taken down (No, it's not Mattyhex's Celestia Medium Redux font, because Purple Tinker's Celestia Medium font was created before Mattyhex created Celestia Medium Redux). This font is similar in style to 'Generation B' by Harold Lohner, as found in the MLP:FiM logo.
Based off the original PNG found at:
http://web.archive.org/web/20130418041929/http://arch.413chan.net/ponyfont-%28n1298218593850%29.png
For an interesting blog post on this font, see here:
http://kefkafloyd.deviantart.com/journal/Why-You-Shouldn-t-Use-The-Celestia-Medium-Font-217927176?offset=0#commentsFree for Personal Use
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.