flac2any is written in simple Ruby scripts that can batch convert FLAC audio files to virtually anything else (e.g. MP3 via LAME, Ogg/Vorbis via oggenc, AAC via faac), keeping metadata along the way. It is as portable as Ruby, and it only requires that you have flac, metaflac, and the encoder you wish to use installed. Custom paths to the executables for said programs are easily specified by editting the configuration bit in the script.

Note: flac2any is currently undergoing a conversion from Ruby to bash/awk. The author of the software barely knows anything about Ruby, so it would be more appropriate for the programs to be written in a language he actually knows how to use.

flac2any is also donated to the public domain, and any modifications contributed back to the main codebase must also be donated to the public domain. It may also be distributed under the MIT License, but any license given is somewhat pointless as they require copyright to do anything.

To download, you can do a Mercurial checkout as described in the "Source" tab.