Ogone is a class that provides a wrapper for more easily implementing the Ogone.com payment system in your PHP applications. Given your Ogone account's configuration, it will generate forms and process Ogone's payment response. Both the legacy method and the new way to calculate SHA signatures are supported.
webtools.class is a PHP class of useful functions for websites, including connecting to MySQL (with error reporting), IP-to-location information, creating salted MD5 passwords and validating MD5 passwords, shortening URLs with the Bitly API, email validation, and sanitizing user input.
APIcaller is a class that helps you to build API wrappers. You don't have to worry about building URLs, or even about parsing the requested data. As an example, if an API requires an API key, you can set this key as a default value and it'll be always sent with the API request. The API needs to return the data in JSON format, otherwise an execption will be thrown.
phpEquations is a PHP class that can find the solutions of linear, polynomial, and trigonometric mathematical equations and systems. It takes a string with one or more equations and parses it to solve the equations. The solutions are returned as an associative array with the values of each equation variable. The class uses a variation of Newton's method with a special technique, called Blocking, to maximize speed by reducing a large problem into smaller problems with fewer variables. The time limit for running the algorithm, the number of variables, the number of iterations, and the iteration step are configurable parameters.