This site will look much better in a browser that supports web standards, but it is accessible to any browser or Internet device.
Sudo is not the only game in town of course. I won't comment on some of the other options as I haven't spent much time working with them (and I'd probably be a bit biased). If you would like to add to this list, please send mail to sudo@sudo.ws.
Below is a list of free sudo-like utilities that I am aware of:
Additionally, I know of the following commercial packages: