enhance_book_photo is a command-line tool for enhancing photographs of pages from books. On such photos, the light is usually not equal on all parts of the picture; some parts are brighter, some parts are darker. This can disrupt OCR or reduce the efficiency of conversion to djvu. enhance_book_photo equalizes the brightness of such photos.
Kometka is a JavaScript and PHP library for making AJAX programs whose instances communicate with each other. The communication server is written in PHP and the communication clients are written in JavaScript. When one client sends a message to the server, the server pushes that message to all clients (using the comet technique). With this library, you can write chat programs, multiplayer online games, and more.
thanks I didn't know R before. I saw this article on Freshmeat. I found R is what I need now. I started using R. Thanks.