From itcfonts.com:

About International Typeface Corporation

An international leader in typeface design and marketing for over 30 years, ITC collaborates with world-class designers to provide a library of more than 1,500 classic typefaces and innovative new designs. ITC has also helped to raise the standards of design quality, and focused attention on the ethical issues related to design protection and licensing.

While renowned for classic designs, ITC has aggressively expanded the scope of its type library to include more contemporary designs, including distinctive display faces and inventive illustration fonts (called DesignFonts). Further expanding the spectrum of its type collection, ITC is now developing and releasing approximately 30 new typefaces each year.

Font Packages from the International Typeface Corp.
Preview, compare and purchase typefaces from the ITC type library. Thousands of fonts that always include both PostScript and TrueType formats for Windows and Mac computers.

See individual font set types:
[pkgs] [A—B] [C—D] [E—F] [G—I] [J—L] [M—O] [P—S] [T—Z]