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Dr Mathis Wackernagel's (developer of the ecological footprint) footprint calculator. "Every semester I have my students calculate their Footprint, change their lifestyle for one week to decrease that Footprint, then compare the results and how it would impact the number of people that could sustainably exist on the planet. Students are shocked when they discover their results. The fact that it is personal and tells them how many planets we would need if everyone on the planet lived as they do drives home the issue better than I ever could in lecture."

Online Image to PDF converter converts JPG to PDF with one click and without restrictions on file size. Image converter supports a large number of image formats

The "Friend Of A Friend" (FOAF) project is part of the Semantic Web initiative to describe human relationships in a machine readable form. Each person's profile contains a number of personal information together with brief descriptions of their friends and aquaintances.

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Square Root Calculator that uses Google Chart API formulas.

Strip HTML Ignore Case Make all lowercase Capitalize first word Remove Duplicates Reverse List Randomize Number results, separator: ____ Terms are seperated by: new line, comma, tab, other: ____ Add ____ to the beginning of each term Add ____ to the end of each term

How does it work? A table is created which is filled with large numbers of 1x1 cells. Each cell has a background colour of the corresponding pixel in the image. That's all it is; just a massive grid of coloured table cells. View the source to see the details

Create, manage, deliver, and track RSS feeds. Real time RSS feed tracking and monitoring including item views, item click-throughs, item CTR, number of subscribers, referring pages, and the types of RSS feed readers used to read your feeds.

Statistic data on number of posts per day. A post is a bookmark a user adds to his collection. There's about 400k posts and 200k links.

service that can aggregate many of the existing measurements of your blog's reach and interactivity into a single (abstract and isolated) number.

Slut-o-meter evaluates the promiscuity of the subject you enter by comparing the number of Google search results with and without "safe-search" enabled.

ODEO: Your friends and site visitors can send you a voice mail without downloading any software or dialing any phone number.

As the first online Regular Expression tester to offer realtime highlighting and offering more languages than any other online tester, ReJAx continues to be the coolest and easiest to use Regular Expression tester on the web. Supported languages:
    * JavaScript
    * PHP 5 PCRE
    * PHP 5 POSIX
    * Ruby - BETA!!
    * PERL 5
    * UNIX Shell Pattern
It is not necessary to enter the beginning and ending slashes in the pattern field. Not all modifiers will be compatible with every language. Backreferences (when available) are usually in the form of \n where n is the reference number