PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham. It is useful for getting command line access to your NetSentron from a Windows machine.
WinSCP is an open source SFTP (SSH File Transfer Protocol) and SCP (Secure CoPy) client for Windows using SSH (Secure SHell). It is written and maintained by Martin Prikryl. It is useful for moving files to and from your NetSentron from a Windows machine.
This is a VPN client written by Enrique E. Martinez that works on Windows 2000 and Windows XP. This client includes the ipsec2k library. This is all that is required to connect to the NetSentron as a roadwarrior from Windows 2000 or Windows XP. Windows 95/98/ME are not supported. Source code and more information can be found here Linsys IPSec Tool.
This is a package of useful tools that will make Ipsec easier to configure on a Windows box. It is written and maintained by Marcus Müller. It is required to use the built in Ipsec VPN of Windows to connect to a NetSentron.