This is a small utility to convert WOFF files to the OTF font format. It uses Javascript, so you can run it in the browser. It depends on the port of zlib to javascript, you need to include this file in your page. Or just go to this page to convert WOFF to OTF online.
convert_streams(<ArrayBuffer>) // returns <ArrayBuffer> containing OTF font
Big thanks to Steffen Hanikel for his Python implementation of this script, which I later converted to Javascript.