ufo2fdk is a bridge between the UFO and the  Adobe Font Development Kit for OpenType (and therefore OpenType fonts).

You can get the latest release version as a bundle  here, you can check out the current development version with Subversion at  http://svn.typesupply.com/packages/ufo2fdk or you can browse the source code here.

Extensive documentation is available in the repository as well as in the bundled distribution.