A curated list of digital specimens
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At first, I was drawn to the bold, confident typesetting at the start of this specimen. It's a little tempered by the fact these are images when, really, they should be web fonts in a digital specimen. That aside, the real beauty of this specimen is at the bottom of the page with clear, instructional illustrations for the features available in the font. I think many type designers and foundries can forget that many font users do not know what 'stylist alternates', for example, might be.
This is something a little different. Universal Specimen is a single page app designed to preview and compare local fonts across multiple languages. Simple controls allow for tweaking column width, line height, and size. A really useful idea for web designers and type designers alike.
Clarinet is a work in progress I stumbled across at Future Fonts. The specimen is somewhat templated (as it's, well, a template), but the page showing examples of various types of layouts and designs are interesting. I wish these were produced with the web-fonts, however, instead of images.