A Story of kpfonts: Reaching the Limits of NFSS
The kpfonts package allows to use a large family of kp fonts. This paper describes a long development of this package, since its beginnings in 2005 to the last release published in 2010. During the years, many options were added to the package, that responded to users' demands. Particular options allow for instance to switch between basic and lighter fonts, between several ligatures of the letter f or the letter t, between recent and old-style shapes of digits, between serif and sans-serif...