Web Open Font Format (WOFF)
The Web Open Font Format (WOFF) is a font format based on the same principles as OpenType and TrueType fonts but has been optimized for use in web pages. WOFF is supported across all recent major browsers. Fonts that are used in webpages are also called "web fonts".
FontCreator supports both importing and exporting WOFF fonts.
More information about Webfonts and how to use them:
More information about the Web Open Font Format: