Support is available through our forums, the wiki and the bug and feature request trackers. Last but not least, FileZilla Server is a free open source FTP and FTPS Server.
We are also offering FileZilla Pro, with additional protocol support for WebDAV, Amazon S3, Backblaze B2, Dropbox, Microsoft OneDrive, Google Drive, Microsoft Azure Blob and File Storage, and Google Cloud Storage. I also tried captain ftp but same problem: both only connect using TLS. I just purchased a 70USD ftp client (CuteFTP Pro for Mac) and it seems like it is not even able to connect to windows ftp servers using ioftpd with SSL. It is open source software distributed free of charge under the terms of the GNU General Public License. The FileZilla Client not only supports FTP, but also FTP over TLS (FTPS) and SFTP.
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