DropBear
Dropbear is a relatively small SSH server and client. It runs on a variety of Unix platforms. Dropbear is open-source software, distributed under an MIT-style license. Dropbear is particularly useful for "embedded"-type Linux (or other Unix) systems, such as wireless routers. If you want to be notified of new releases, or for general discussion of Dropbear, you can subscribe to the relatively low-volume mailing list. With a small memory footprint suitable for memory-constrained environments, Dropbear can compile to a 110kB statically linked binary with uClibc on x86 (only minimal options selected) Dropbear server implements X11 forwarding and authentication-agent forwarding for OpenSSH clients. The server, client, keygen, and key converter can be compiled into a single binary (like busybox) Features can easily be disabled when compiling to save space. The multi-hop mode uses SSH TCP forwarding to tunnel through multiple SSH hosts in a single command.
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KiTTY
KiTTY is a fork from version 0.76 of PuTTY, the best telnet/SSH client in the world. KiTTY is only designed for the Microsoft® Windows® platform. For more information about the original software, or pre-compiled binaries on other systems, you can go to the Simon Tatham PuTTY page. KiTTY has all the features from the original software and adds many others as described on the website. You can check for classical features, and test if they are still working, as usual, auto-command, auto-password, auto-reconnect, transparency, port knocking, hyperlink, print clipboard, embedded launcher, TuTTY features, RuTTY features, system tray, etc. PuTTYCrypt patch to get credentials from certificate (sshpubk.c merge fails). PuTTYCyg to run a Cygwin terminal into KiTTY. Zmodem to transfer files with ZModem protocol. Covidimus patch for the background image. New settings management evolution, ssh core is almost fully rewritten, and Windows core functions have been rewritten too.
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Cygwin
Get that Linux feeling on Windows. Cygwin is a large collection of GNU and open-source tools that provide functionality similar to a Linux distribution on Windows. And a DLL (cygwin1.dll) that provides substantial POSIX API functionality. Cygwin is not a way to run native Linux apps on Windows. You must rebuild your application from the source if you want it to run on Windows. It can't magically make native Windows apps aware of UNIX® functionality like signals, ptys, etc. Again, you need to build your apps from source if you want to take advantage of Cygwin functionality. The Cygwin DLL currently works with all recent, commercially released x86_64 versions of Windows, starting with Windows Vista. Use the setup program to perform a fresh install or to update an existing installation. Keep in mind that individual packages in the distribution are updated separately from the DLL so the Cygwin DLL version is not useful as a general Cygwin distribution release number.
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WinSCP
WinSCP is a popular SFTP client and FTP client for Microsoft Windows! Copy files between a local computer and remote servers using FTP, FTPS, SCP, SFTP, WebDAV, or S3 file transfer protocols. WinSCP is an open source free SFTP client, FTP client, WebDAV client, S3 client and SCP 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. Graphical user interface, translated into many languages. Integration with Windows (drag & drop, URL, shortcut icons). All common operations with files, and support for SFTP and SCP protocols over SSH and FTP and WebDAV and S3 protocols. Batch file scripting and command-line interface and .NET assembly for advanced programming tasks. Directory synchronization in several semi or fully-automatic ways. Integrated text editor, shares site settings with PuTTY, and supports password, keyboard-interactive, public key, and Kerberos authentication.
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