Zsync: An alternative to rsync
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zsync is an alternative to the file transfer software rsync.
Although both programs use the same algorithm, zsync does not require any special access or daemon on the server (read: SSH or rsyncd) to enable you download a file. All the work is done on the client side and the only adjustment needed on the server side is a small control .zsync file accompaining the file intented for zsync-enabled download. The zsync client requests only the updated blocks of the file, making it useful for bandwidth conservation purposes.
More in-depth information about zsync can be found in the technical paper written by its programmer, Mr. Colin Phipps.
zsync is released under the Artistic License, while rsync is covered by the GNU General Public License version 2. Both licenses are certified by OSI.
zsync can be downloaded from its SourceForge project page.
