Here you can download additional fonts for JsIFR3. All these fonts are free which means you can use them in any way you want (private and commercial).
Usage: Upload the file to ~/plugins/system/jsifr3 (or ~/plugins/system/jsifr3_pro) and set JsIFR3-Parameters "font" to custom and "custom-font" to the filename without .swf (for example "gemerald").
You need a free account to download these files. Sign up here