This is a list of some of my favorite server software. Most of the items on this list are either free or open source. If you have any issues setting any of this software up I have most likely written an entry on how to get this setup and running. I will try and make sure to link to those article from this page when I have time.
Adito Web SSL VPN server
Adito is a web-based SSL VPN server. Adito’s is written in Java and has a browser-based AJAX interface. Adito allows easy and safe access to most intranet services with just a web browser. Adito was originally forked from SSL-Explorer.
SSL-Explorer is a fully-featured, web-based SSL VPN server. This project is no longer actively maintained as the SSL-Explorer technology has now been acquired by Barracuda Networks, Inc. download
Webmin is a web gui front end for configuration of Linux systems. It is great for looking after DHCP, VPN, and Web servers. I highly recommend this pragram if you are an administrator. Supposedly you can install this also on Windows boxes and have a similar look and feel to the linux ones.