Very nice List about a lot of Free Tools

Use this backupscript in the console

This script offers a lot of options and was already on ESX 2.x often used!

This is a file conversion tool it will not make any modifications to the source image such as uninstalling VMTools etc... but it will leave your source VMDK un-touched so you can continue to use it.

Free utility to revert multiple snaphosts

Free SSH file transfer, terminal and tunneling

To work on the console the right free tool.

The best and fastest tool to copy files from and to the ESX Host.

To view all folders: check 'View -> All folders' menu item to see all the directories.

WinSCP is an open source free SFTP client for Windows using SSH.
Norton like Userinterface. Somtimes some problems when transfering files.

Virtualization Monitoring
Monitor any virtual machine or hypervisor from VMWare and Xen. Monitoring critical resources of hosts or guests.