WinSCP is an open source free SFTP client, SCP client, FTPS client and FTP client for Windows. Its main function is file transfer between a local and a remote computer. Beyond this, WinSCP offers scripting and basic file manager functionality.
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It supports Directory synchronization in several semi or fully automatic ways, All common operations with files, Integrated text editor and lot more

WinSCP is an open source free SFTP client, SCP client, FTPS client and FTP client for Windows. Its main function is file transfer between a local and a remote computer. Beyond this, WinSCP offers scripting and basic file manager functionality.

WinSCP - Free SFTP, SCP and FTP client for Windows

Rclone ("rsync for cloud storage") is a command line program to sync files and directories to and from different cloud storage providers like Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Yandex.

Rclone - rsync for cloud storage like Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Yandex Files 

FreeFileSync helps you synchronize files and synchronize folders for Windows, Linux and macOS. It is designed to save your time setting up and running backup jobs while having nice visual feedback along the way. It helps you to synchronize network shares and local disks, Synchrnize via FTP, Detect moved and renamed files and folders, Compare files by content, Manage versions of deleted/updated files and lot more.

FreeFileSync - Synchronize Files and Folders

ShareX is a free and open source program that lets you capture or record any area of your screen and share it with a single press of a key. It also allows uploading images, text or other types of files to over 50 supported destinations you can choose from.

ShareX - Screen capture, file sharing and productivity tool

curl is used in command lines or scripts to transfer data. It is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the internet transfer backbone for thousands of software applications affecting billions of humans daily. 
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It supports DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, Telnet and TFTP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, HTTP/2, cookies, user+password authentication (Basic, Plain, Digest, CRAM-MD5, NTLM, Negotiate and Kerberos), file transfer resume, proxy tunneling and more.

curl is used in command lines or scripts to transfer data. It is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the internet transfer backbone for thousands of software applications affecting billions of humans daily. 

curl - A command line tool and library for transferring data with URL syntax, supporting HTTP, HTTPS, FTP, FTPS, GOPHER, TFTP, SCP, SFTP, SMB, TELNET, DICT, LDAP, LDAPS, FILE, IMAP, SMTP, POP3, RTSP and RTMP

aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink. aria2 can be manipulated via built-in JSON-RPC and XML-RPC interfaces. It has full featured BitTorrent Client features like DHT, PEX, Encryption, Magnet URI, Web-Seeding, Selective Downloads, Local Peer Discovery and UDP tracker. 

aria2 - The ultra fast download utility

FileZilla is a complete FTP solution with support of Client and Server. It is a cross platform and supports FTP, FTPS and SFTP protocol. Its feature include IPV6 support, Powerful Site Manager and transfer queue, Synchronized directory browsing, Remote file search and lot more.

FileZilla - FTP Client and Server

Cyberduck is a libre server and cloud storage browser for Mac and Windows with support for FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox.


Cyberduck - Libre server and cloud storage browser for Mac and Windows

The Apache FtpServer is a 100% pure Java FTP server. It's designed to be a complete and portable FTP server engine solution based on currently available open protocols. FtpServer can be run standalone as a Windows service or Unix/Linux daemon, or embedded into a Java application. We also provide support for integration within Spring applications and provide our releases as OSGi bundles.

Apache FtpServer - The Apache FtpServer is a 100% pure Java FTP server

Cyberduck is a libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser for Mac and Windows. 

Cyberduck - FTP / SFTP for Windows and Mac

ftp - FTP client package for Go

mTCP is a TCP/IP stack and applications designed to run well on older x86 personal computers running DOS operating systems. Features include stable/robust code and high performance even on the slowest machines. Current applications include an IRC client (IRCjr), an FTP client, a Telnet client, Netcat, Ping, and SNTP client, a DHCP client, HtGet, and an FTP server. 

Mtcp - TCP/IP and applications for DOS systems

aria2.js is a NodeJS Javascript library and cli for aria2, "The next generation download utility". It controls aria2 via its JSON-RPC interface.

aria2.js - JavaScript library for aria2, "The next generation download utility"

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