EFF Mackintosh font is based on the work of Charles Rennie Mackintosh. The font has a multitude of alternative letters as well as double and triple letters as used by Charles Rennie Mackintosh. Although any text can be set in this font, you can really have fun choosing alternative and double letters to produce a desired typographical effect
Although some letters appear to be accented, such as Ä, they are not really suitable for any other languages except English and Latin.
There is also a companion font EFF Mackintosh Ornaments.
This font is supplied with a detailed manual.