Description:
The Replicator lets you distribute large numbers of files to many people efficiently. The software automatically downloads just the changed files and deletes ones no longer part of the distribution. Unlike other similar tools, all it requires is an ordinary HTTP website. It requires no code to run on the server. It can also work with CDs, and LANs. Custom configured for each customer. Not free. Registration includes help in setting.
Screen Shot

Keywords:
replicator, broadcast, replicate, synch, upload, download, delta, just changes, secure download, rsynch, synchronise, synchronize