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ARToolKit is a software library for building Augmented Reality (AR) applications. These are applications that involve the overlay of virtual imagery on the real world. For example, in the image to the right a three-dimensional virtual character appears standing on a real card. It can be seen by the user in the head set display they are wearing. When the user moves the card, the virtual character moves with it and appears attached to the real object.

CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-content, web-based collaborative model termed the "FlexBook," CK-12 intends to pioneer the generation and distribution of high quality educational content that will serve both as core text as well as provide an adaptive environment for learning through the FlexBook Platform™.

52°North refers to the degree of latitude which intersects the founding organizations' home - the city of Münster, Germany. 52°North - the R&D Network The open source software initiative 52°North is an international network of partners from research, industry and public administration. Its mission is to foster the development of new concepts and technologies in Geoinformatics through a common innovation process. Partners participate in so called R&D communities, focusing on common themes, such as Sensor Web Enablement (SWE) or web-based Geoprocessing, for example. All software developed within this collaborative development process is published under an open source license. The 52°North partners have a long and outstanding record in the Geo-IT domain. They are actively contributing to the development of international standards, e.g. at W3C, ISO, OGC or INSPIRE.

GeoGebra Free mathematics software for learning and teaching Interactive graphics, algebra and spreadsheet From elementary school to university level Free learning materials

Rivendell is a complete radio broadcast automation solution, with facilities for the acquisition, management, scheduling and playout of audio content. It has all of the features one would expect in a modern, fully-fledged radio automation system, including support for both PCM and MPEG audio encoding, full voicetracking and log customization as well as support for a wide variety of third party software and hardware. As a robust, functionally complete digital audio system for broadcast radio applications, Rivendell uses industry standard components like the GNU/Linux Operating System, the AudioScience HPI Driver Architecture and the MySQL Database Engine. Rivendell is available under the GNU Public License. Further design details are available here.

Use Open Wonderland to build your virtual world! Create dynamic learning environments, collaborative business applications, or interactive, multi-user simulations. Start with a blank slate, or modify an existing world. While some types of worlds can be created by end-users or 3D artists, this toolkit is designed primarily for developers familiar with the Java programming language. As a developer, you can extend any part of the system and add functionality by creating modules, the Wonderland version of plugins. Click the Browse button above to explore the extensions currently available in the Wonderland Module Warehouse.