rssh
rssh is a restricted shell for use with OpenSSH, allowing only scp and/or sftp. It includes support for rdist, rsync, and cvs. For example, if you have a server which you only want to allow users to copy files off of via scp, without providing shell access, you can use rssh to do that.
Site: http://www.pizzashack.org/rssh
Download: http://www.pizzashack.org/rssh/downloads.shtml
