font-change – Macros to change text and math­e­mat­ics fonts in plain TeX

Macros to Change Text and Math­e­mat­ics fonts in TeX: 45 Beau­ti­ful Vari­ants
The macros are writ­ten for plain TeX and may be used with other pack­ages like AmSTeX, eplain, etc. They also work with X∃TeX.
The macros al­low users to change the fonts (for both text and math­e­mat­ics) in their TeX doc­u­ment with only one state­ment. The fonts may be used read­ily at var­i­ous pre­de­fined sizes.
All the fonts called by these macro files are free and are in­cluded in cur­rent MiKTeX and TeX Live dis­tri­bu­tions.