Xmanager is a Servers & Network software developed by NetSarang Computer, Inc. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Xmanager:
 Xmanager is a powerful and easy-to-use PC X server that runs on Windows platforms. It allows you to bring remote Unix/Linux desktops to your Windows PC seamlessly. You can also run remote X applications Securely through the SSH (Secure Shell) protocol even when your Windows PC is inside a private network and a firewall is between your PC and the remote server.

Features:

-Graphical improvement of user interface(support Render extension)
-Safer & Easier way to access remote UNIX/Linux
-The most powerful and intuitive session management tool in the market
-Xbrowser Dynamically searches for any available UNIX/Linux hosts
-Instant connection using the Address bar
-Instant connection to the UNIX/Linux machines using the Address bar
-Using the Address bar to start TELNET/SSH sessions
-Using the Address bar to start FTP sessions
-Sending Xmanager/Xstart sessions via email
-Creating desktop ShortCuts for faster access to the applications you need
-Creating session with New Session Wizard
-Applying different Profiles for each server and application
-Editing a Xconfig profile and applying it to multiple Xmanager sessions
-Securing your communication with the server using the SSH protocol
-Generating the user/public key with SSH Key Generation Wizard
-Preventing unauthorized use of Xmanager with Access Control
-Opening multiple Xmanager instances with different X server settings
-Using MS-DOS command line options to connect to the UNIX/Linux hosts.