PhpMathPublisher is a system for publishing Web pages that include mathematical expressions. Webmasters only have to install some fonts as no CGI scripts or LaTeX programs are required. Each formula is transformed into an image and the generated Web pages can be displayed by all browsers. It can be easily used in a CMS, blogs, and forums.
Electronic Engineering Tool is a Web-based tool that includes an electronic formula calculator and converter functions. It very useful when working with electronics, both for engineers and amateurs. For example, it includes converters for dBm-to-Watt and Fahrenheit-to-Celsius, and it can calculate Ohm's law, filters, thermal resistant C/W, SWR, coil inductance, capacitor capacity, and more.
Electowidget is a PHP library (initially a plugin for MediaWiki) designed to make it possible to conduct Internet polls and elections using many different voting systems, including the Schulze (Condorcet) method, instant runoff voting, approval voting, and even plain old plurality. It also assists in explaining different election methods by providing an easy way of tallying example elections and comparing the results as computed by different elections. The modular design allows for plugging in new election tallying methods, different ballot designs, and different ballot formats.
polygon is a set of PHP classes that can be used to perform different types of geometric operations with arbitary polygons. It provides generic polygon and vertex classes that support mixing lines and arc segments between vertices. Polygons may be self-intersecting, convex, or concave. It provides means to perform intersection and union operations with the shapes and to compute shape clipping.