This is a clientless SSL VPN solution (that's free). I run it on either a Ubuntu 10 box (as a VMware guest OS) or on a Windows box (as a VMWare guest OS).
The way it works is you connect via a web browser, then your servers or connections under that can be configured as applications or web forwards.
So when I connect via the page (which is a SSL VPN connection), I then have shortcuts setup for connecting to servers via VNC, RDP, SSH, and even HTTP. Each shortcut launches a Java applet (for RDP, SSH, VNC, WebDav, FTP, etc.)
So for my Ubuntu server I connect via either SSH or VNC, I goto most Windows boxes via UltraVNC (more stable than RDP), and I can pull up the web interface of my firewall, PDU, UPS, and even network management console with a web forward.
Oh and the the really cool part is that VMware supports VNC protocol natively at the guest-layer, so this allows me to control VMware guests at the BIOS level.
There are two similar commercial solutions, one is the Cisco ASA platform which gives you a clientless SSL VPN, and the other is the Barracuda SSL VPN appliance.
http://sourceforge.net/projects/openvpn-als/
