SecureBridge - Сlient and server components for SSH, SFTP, FTPS, SSL, HTTP/HTTPS, WebSocket, and SignalR protocols
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.
FireSSH - After 13 years and 25 million downloads later, Firefox has officially removed FireFTP and FireSSH support from the browser. Thus, I've ended support / development of the addons. I recommend switching to Waterfox to continue using the addons.
PowerShell - Download WMF. Windows Management Framework contains the latest versions of PowerShell, DSC, WMI, and WinRM for older versions of Windows. PowerShell Module Browser. Search for PowerShell modules and cmdlets.
Userify - Userify is a cloud-based SSH key management solution.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more