Recs.
Updated
Available in a free and a paid Pro version which also supports WebDAV, Amazon S3, Backblaze B2, Dropbox, Microsoft OneDrive, Google Drive, Microsoft Azure Blob and File Storage, and Google Cloud Storage.
SpecsUpdate
Pros
Pro Free / Open Source (GNU GPL)
FileZilla is free open-source software distributed under the terms of the GNU General Public License free of charge.
Basically this means that everyone, including corporate entities, can use FileZilla, including but not limited to private, educational and commercial use.
Pro Supports FTPS
FileZilla Server is a server that supports FTP and FTP over SSL/TLS which provides secure encrypted connections to the server.
(FTPS = FTP over SSL: http://en.wikipedia.org/wiki/FTPS)
Cons
Con Non-Windows platforms not supported (for server)
Sadly, the commercial FileZilla Server is not able to run on Unix, OSX or Linux
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Flagged Pros + Cons
Pro Free and open source
FileZilla is free open-source software distributed under the terms of the GNU General Public License free of charge. Basically this means that everyone, including corporate entities, can use FileZilla, including but not limited to private, educational and commercial use.
Pro Suppots FTP and FTPS
FileZilla Server is a server that supports FTP and FTP over SSL/TLS which provides secure encrypted connections to the server.