Shapado is a multi-topic and multi-language question-and-answer Web site service à la StackOverFlow where users can vote on questions and answers and receive karma. Unlike StackOverFlow, people can ask questions on various topic by picking a category (science, programming, business, politics, etc.). It is also possible to subscribe to categories or groups of categories.
FluxBB is a fast, light, user-friendly forum application for Web sites. It was originally based on PunBB and supports UTF-8, XHTML, and internationalization, and leaves out some of the less than essential features of other forums without sacrificing essential functionality or usability.