ExtraFonts is a font pack for BlackBerry that gives you more fonts to choose from.
The add-on is very simple because it includes over 100 fonts that can be used as the default font on your device. Many first and third party apps can also recognize ExtraFonts so you do not have to worry about your new fonts not being compatible with other apps.
There is nothing spectacular in terms of singular use because it is an add-on, but it does let you get away from the the standard fonts on BlackBerry.
ExtraFonts is a great pack of fonts.