Windows

• PuTTY is an SSH1+SSH2 implementation. PSCP, an scp-style program for Windows, is also available.

  PuTTY is available under the MIT licence (BSD-like).

  "PuTTY is a free implementation of Telnet and SSH for Win32 platforms, written and maintained primarily by Simon Tatham, who lives in Great Britain."

• TTSSH (SSH1) is an SSH1-only implementation, by Robert O'Callahan.

  "TTSSH is a free SSH client for Windows. It is implemented as an extension DLL for Teraterm Pro. Teraterm Pro is a superb free terminal emulator/telnet client for Windows, and its source is available. TTSSH adds SSH capabilities to Teraterm Pro without sacrificing any of Teraterm's existing functionality. TTSSH is also free to download and use and its source is available too, with an open source license. Furthermore, TTSSH has been developed entirely in Australia [...]."

• Cygwin (POSIX software on top of Windows)

  OpenSSH (SSH1 and SSH2 protocol) with Cygwin can run on Windows using the portable version of OpenSSH.

• MSSH

  MSSH from the Metropolitan State College of Denver supports Windows 95 and Windows 98, supporting SSH1 protocol.

• Secure iXplorer GPL

  Secure iXplorer GPL is graphical front end to PuTTY's pscp.exe.

• WinSCP

  WinSCP is a scp(1) program for Windows, with PuTTY integrated into it.

• FileZilla

  FileZilla is a powerful FTP-client for Windows 9x, ME, NT4, 2000 and XP. It has been designed for ease of use and with support for as many features as possible, while still being fast and reliable. It supports SFTP.

• SSHWindows

OpenSSH for Windows is a free package that installs a minimal OpenSSH server and client utilities in the Cygwin package without needing the full Cygwin installation. It provides full SSH/SCP/SFTP support, SSH terminal support provides a familiar Windows Command prompt while retaining Unix/Cygwin-style paths for SCP and SFTP.