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Have a look a Peteris tutorial with full source download. You are guided through all the steps to build an universal plugin-based website scraper that gets posts from social news and social bookmarking websites. The user interface is done in PHP and Smarty template and caching engine.

Part 1: http://www.catonmat.net/blog/making-of-picurls-popurls-for-pictures-part-one/

Part 2: http://www.catonmat.net/blog/making-of-picurls-popurls-for-pictures-part-two/ 

PHPGraphLib is a PHP 4.3+ friendly object-oriented script that has powerful customization features, allowing you to generate the perfect bar graph for any application. Best used with dynamically data, PHPGraphLib allows easy visual interpretation of sophisticated data sets. Simply feed PHPGraphLib an array of data points, and it will generate a .png image of your data. At less than 25kb in size, it will not slow down your scripts. If no customizations are made, PHPGraphLib adjusts the scale and axis of the graph to fit any data, including large numbers, decimal numbers, and negative numbers.

URL: http://www.ebrueggeman.com/phpgraphlib/index.php

FusionCharts Free is a flash charting component that can be used to render data-driven & animated charts for your web applications and presentations. You don’t need a flash editor to edit FusionCharts Free. Be aware that you can’t load the free version of this component in other flash movies.

Features:

• without any messages or link backs on charts.
• 20 chart types supported
• some are animated
• rotate option

URL: http://www.fusioncharts.com/free/

Plot dynamic pie, line and bar charts. PlotKit supports HTML Canvas and also SVG via Adobe SVG Viewer and native browser support.

URL: http://www.liquidx.net/plotkit/

Roll your mouse of image to see annotations. Use controls above the photo to add/edit/delete notes. Flickr’s note feature is a derrivation of this cute script.

URL: http://fotonotes.net/

Using this script you can create attractive CSS and PHP bar graphs that are always up to date.

URL: http://www.terrill.ca/design/vertical_bar_graphs/

This is a fully configurable php/flash chart script. Using it you can easily create animated pies or donuts for your web site.
Please note that this script is avaiable in two versions. The free version is equally to the paid version apart from a small link to the amCharts website.

URL: http://www.amcharts.com/pie/