Cloudy download

It is an FTP/FTPS and SFTP client designed exclusively for OS X Yosemite.
Download on the Mac App Store

Alternative apps

ForkLift - File Manager and FTP/SFTP/WebDAV/Amazon S3 client
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Viper FTP Lite
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FTP Disk
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Remote Connections Manager
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An utility that allows to launch ssh sessions with password authentication