From Skyshape Software:
OGGResizer - Vorbis Compressor is designed to reduce the size of OGG Vorbis files by recompressing them with a lower bit rate.
Many users and software and game developers choose OGG Vorbis for encoding their music or sound files instead of MP3 or other popular formats.
There are many situations when you need to reduce the size of your OGG Vorbis files. OGGResizer gives you a way to compress them.
Using OGGResizer - Vorbis Compressor, you can reduce the size of OGG Vorbis files by two, three, five, or even more times.
OGGResizer is a powerful and easy-to-use utility to compress OGG Vorbis files. A wide selection of bitrates and a preview feature allows you to find the perfect balance between quality and size.