Celtic Font

• The Celtic Font by Sam Wang has a geometric style similar to many Celtic designs. It was created in 1992, and has minimal serifs on most of its letters. The letters have distinctive curving and unique letterforms for the lowercase letters. This font can be found online for free, as long as it is for personal use.
  
  

Irish Unci

• The Irish Unci font by Manfred Klein was created in 2003. The font also has Celtic styling, but with more straight lettering and recognizable lowercase letters. It has very minimal serifs on most of its letters. It can be found online for free, and commercial users can access the font by contacting the designer.
  
  

Celtic Garamond the 2nd

• Celtic Garamond the 2nd by Levi Halmos was created in 2000. This is a much more subtle font, with diamond-shaped dots over the lowercase "i" and "j." This font is straight like Irish Unci, with gently curving serifs extending from the bottoms of some letters. This font is free to use for personal use, but is not available for commercial use.
  
  

Celtic Knot

• The Celtic Knot font was created by Lord Kyl MacKay and is a decorative font. It includes bold, black portions of most letters with traditional Celtic knots interspersed. For example, the capital "I" is decorated with a knot right in the center of the letter. This font is free to use for personal and commercial purposes.