These are fonts for use with the Arduino GLCD library for KS0108 style LCD display. CalBlk36 is a large heavy sans serif font, not unlike Arial Black CalLite24 is a smaller light sans serif font similar to Arial. Add the *.h files to the fonts folder in the GLCD libary. The files with no extension are font files for use with Font Creator - http://www.apetech.de/fontCreator MIT Licensed.