Here is an innovative way of using your web browser to run a fully functional unix shell. If you go to http://cb.vu you will actually be logging in to a shell terminal on a web server. You can define which commands "www" users will have access to run. For those of you from the Windows world this is like having your windows desktop available over a web browser without the need of any special clients

I believe this site actually launches a shell within a bunch of java scripts. A very nice use of a web browsers capabilities. This type of utility may have some good practical uses.

Cfengine is an open source tool that allows system administrators to maintain 1 to thousands of unix based systems. It automates almost every aspect of system administration. Cfengine is a direct competitor to commercial software from Blade Logic and OPsware. Both of these commercial packages come with fancy GUIs and nice features, but they also come with hefty licensing fees (can get close to $1K per server managed + maintenance fees).