Fonts In Use is an archive of over 34,000 real-world typography examples - packaging, posters, books, web design - tagged by typeface and searchable by topic or format.
Seeing a typeface actually applied in shipped work tells you more about how it reads at real sizes and in real contexts than a specimen sheet ever will.
Good research step before committing to a typeface for a project, especially for something like packaging or editorial where context matters.
Free to browse, no signup required, but it's purely a reference archive - it doesn't host or sell fonts, so you'll still need to license whatever you find through its actual foundry.
A searchable archive of real-world typographic design.