best image compression & file transfer opensource software........?????????

Hi

One of my close associate who is running geoinformatics business is desperately looking for the open
source tools available for the maximum possible image compression and effective & secured file transfer
tools other than normal ftp,sftp,scp to share the image(high dense) files from their clients. If anybody
come across the solution for such requirements, we shall thank them and their help is highly appreciated.

with thanks
s.mahalingam

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