とりあえず
S3QL
http://sourceforge.jp/projects/freshmeat_s3ql/
http://code.google.com/p/s3ql/
s3bakcer
http://code.google.com/p/s3backer/
s3fs
http://code.google.com/p/s3fs/
s3Sync
s3cmd
CloudXport
http://navitas-tech.com/Products/cloudxPort.aspx