SSH.NET component
Shortname: wodSSH.NET

wodSSH.NET is (Secure Shell Client) component, as well as Telnet component, which handles client-side of these protocols. It's fully implemented in managed C#, and tested on Windows platforms - but has no requirements for windows win32 libraries.
Why don't you give a shot and check it out for yourself?

SFTP.NET component
Shortname: wodSFTP.NET

Just like our best selling product wodSFTP ActiveX, this component implements the client side of the SFTP protocol. It is written in C# and has an MS-like interface to completely integrate into your dotnet applications. It supports file uploading, downloading, deleting, directory creation.... It works in both blocking and non-blocking modes, making it suitable for use in your applications written in ASP, ASPX, VB, VB.NET, C#, etc.

FtpDLX.NET component
Shortname: wodFtpDLX.NET

FtpDLX.NET component is FTP (or, better to say, file-transfer) client component. Not only it provides old fashion FTP protocol, it allows you also to use secured SFTP (Secure-Shell version 2 subsystem, very popular on UNIX), and FTP+SSL protocols as well. Using different protocols is completelly transparent for usage. You have same interface and different protocol - just by changing one property! It is written in pure .NET in C#, NET 2.0 framework required to run.