Fonts In Use is a public archive of typography indexed by typeface, format, industry, and period. Supported by examples contributed by the public, they document and examine graphic design with the goal of improving typographic literacy and appreciation. Designers use their site for project research, type selection and pairing, and discovering new ways to choose and use fonts.
The On-Line Encyclopedia of Integer Sequences
The On-Line Encyclopedia of Integer Sequences is an online database of integer sequences. It was created and maintained by Neil Sloane.