Sethi Deterministic Turing Machine Simulator is a Turing Machine Simulator that takes a text file containing the Machine's description and an input string, which consists of {0,1} and outputs a message. As a deterministic Turing Machine, not only will it reject if the transition function isn't specified for some given arguments (of the tape and state symbols), but it will also report "Invalid TM" if multiple transitions are specified for a given pair (state, tape symbol).
The Sethi Family Guestbook is a multi-format guestbook script written as a single PHP file that requires no installation. It features page spanning, (optional) private comments, user-selection of number of entries per page to display, multiple guestbook formats (elegant, simple, or standard), and background color. No database is required. It supports image verification using random text as part of a CAPTCHA system. It also uses other techniques to foil spam robots. It supports multiple formats, mangled email display, and a fully customizable interface.
Sethi Search Utility is a simple command line utility to submit a search to Google, Yahoo!, or MSN and show the (text) results on standard output. Support for several search engines is included. It's currently in serious need of a re-write, especially to avoid scraping and become a good engine using the search APIs provided.