Here are a few web apps and sites I've made, which you may find useful.
- WhatHeaders.com - An HTTP client inspection tool that reports the HTTP GET request headers. Mainly intended to help mobile web developers (mobile browsers are mysterious and underdocumented), but can be helpful with any "black-box" http client.
- Linux Kernel Boot Parameters Reference. Actually a page on this site, and the most popular one at that! I intend to spin it off as a separate web app/site someday.
- HomeLoanPhone.com - a mobile-phone-optimized mortgage calculator.
- FindForMe.net - An automated shopping assistant. For those who say, "boy, I could sure use help spending my money." (Feel free to also mail me cash.)
- Finally! Learn what all the mystery is about for cozifuteriloni, uopmeroofixiatiq, yegurixullofad, junoterrifkhalum and pognofisureticlude.
- Debian Auto-package of the day - A fully automated introduction to exciting new Debian software packages. How did you ever get by without this!
- Daily Tao Te Ching - A mobile webapp version of my native iPhone Tao Te Ching app. The iPhone app has a much nicer interface; the mobile webapp has the advantage of working on other smartphones. There's also a twitter Tao Te Ching if you're into that - updated from a Python bot on one of my web servers. (If all that's not ridiculously techno-hipster, I don't know what is!)
- Boost Math - This website collects most of my writings on mathematics. In particular, it includes the complete online text of two books, about doing mental algebra and mental calculus.