FontForge will allow you to save a font as .SFD, which will then allow you to save as a TTC format, which then can have the extension changed from TTC to TTF…yeah, I know…
In order to use some javascript based font rendering libraries, you tend to need to have the font which you wish to translate as a TTF (True Type Font) or OTF (Open Type Face) format. Problem is there are many other formats that exist. Font Forge is a prime tool for font manipulation.
Also great font resource: Open Font Library
And great javascript rendering font system: Typekit