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MediaWiki
[470 users on Ohloh]
MediaWiki is the collaborative editing software that runs Wikipedia, the free encyclopaedia, and other projects. It's designed to handle a large number of users and pages without imposing too rigid a structure or workflow.
FreeMind
[176 users on Ohloh]
FreeMind is Mind-Mapping tool and an intuitive editor for tree-structured data. It features a modular design, and can be used to edit any kind of data, dependent on the current mode. The data is represented as a Mind-Map, while data, behavior, node style, edge style, color, etc. are determined by the mode. It features one-click fold, unfold, and "follow link" operations.
Moodle
[86 users on Ohloh]
Moodle is a learning management system for producing Internet-based course Web sites. It is written in PHP and is easy to install and use on Linux, Windows, Mac OS X, SunOS, BSD, and Netware 6. It has been designed to support modern pedagogies based on social constructionist theory, and includes activity modules such as forums, chats, resources, journals, quizzes, surveys, choices, workshops, glossaries, lessons, and assignments. It has been translated into over 70 languages, with more on the wa...
gnuplot
[72 users on Ohloh]
gnuplot plots 2d and 3d graphs, from a data file or with a formula. It has an interactive mode with online help, or it can be used non-interactively. gnuplot does function fitting to data sets, and it does output to many terminals, among which are PostScript, X11 display, PNG, and GIF (via the old gd library).
Celestia
[45 users on Ohloh]
Celestia is an OpenGL-based 3D space simulation for Unix and Win32 that lets you travel through the solar system, to the stars, and even beyond the galaxy. Visit over 100,000 stars, 100 solar system bodies, and all known extrasolar planets.
Stellarium
[43 users on Ohloh]
Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets and nebulae, and has many other features including multiple panoramic landscapes, fog, light pollution simulation and a built-in scripting engine.

Stellarium comes with a star catalogue of about 600 thousand stars and it is possible to download extra catalogues with up to 210 million stars.

Stellarium has multiple sky cultures - see the constellations from the traditions o...

OLAT
[42 users on Ohloh]
OLAT is the acronym for Online Learning And Training. It is a web application - a Learning Management System - that supports any kind of online learning, teaching, and tutoring with little didactical restrictions. OLAT is free software/open source, and has been developed since 1999 at the University of Zürich and won the MeDiDa-Prix in the year 2000. OLAT has support for various E-learning standards such as IMS Content Packaging, IMS QTI and SCORM. OLAT offers all the tools that you'd expect of ...
Kino
[31 users on Ohloh]
Kino is a non-linear DV (digital video) editor for GNU/Linux. It features integration with IEEE-1394 for capture, VTR control, and recording back to the camera. It captures video to disk in RawDV and AVI format, in both type-1 DV and type-2 DV (separate audio stream) encodings. You can load multiple video clips, cut and paste portions of video/audio, and save to an edit decision list (SMIL XML format). Most edit and navigation commands are mapped to equivalent vi key commands. Also, Kino can loa...
KStars
[18 users on Ohloh]
KStars is a graphical desktop planetarium for KDE. It provides an accurate simulation of the night sky, as seen from any location on Earth, on any date. The display includes 40,000 stars, 13,000 deep-sky objects, 2500 comets and asteroids, all 8 planets, and the Sun and Moon.
Moodle (contrib)
[18 users on Ohloh]
This code is third-party or popular plugins, patches and tools for Moodle that are separate from the main codebase.
Natural Language Toolkit (NLTK)
[18 users on Ohloh]
NLTK — the Natural Language Toolkit — is a suite of open source Python modules, linguistic data and documentation for research and development in natural language processing, supporting dozens of NLP tasks, with distributions for Windows, Mac OSX and Linux.
ILIAS
[17 users on Ohloh]
ILIAS is a powerful web-based learning management system that allows users to create, edit and publish learning and teaching material in an integrated system with their normal web browsers. Tools for cooperative working and communication are included as well. ILIAS is available as open source software under the GNU General Public License (GPL). Universities, educational institutions, private and public companies, and every interested person may use the system free of charge and contribute to its...
Claroline
[17 users on Ohloh]
Claroline is a free application based on PHP/MySQL allowing teachers or education organizations to create and administrate courses through the web.

Developed from teachers to teachers, Claroline is built over sound pedagogical principles allowing a large variety of pedagogical setup including widening of traditional classroom and online collaborative learning.

Dokeos
[13 users on Ohloh]
Dokeos is an Open Source e-learning and course management web application translated in 34 languages and helping more than 3.600 organisations worldwide to manage learning and collaboration activities.

Dokeos is widely recognised as more easy to use than most of its competitors by wide training organisations all over Europe and Latin America.

In Dokeos, you can manage courses, students, documents, forums and exercises, and import SCORM content and PowerPoint presentations directly in...

Mahara
[12 users on Ohloh]
Mahara is a user-centric Open Source ePortfolio System based on an Artefacts, Views and Groups framework.
RapidMiner (YALE): Java Data Mining
[10 users on Ohloh]
RapidMiner (formerly YALE) is the most comprehensive open-source software for intelligent data analysis, data mining, knowledge discovery, machine learning, predictive analytics, forecasting, and analytics in business intelligence (BI). RapidMiner provides more than 400 data mining operators, a graphical user interface (GUI), an online tutorial with hands-on data mining applications, a comprehensive PDF tutorial, many visualization schemes for data sets and data mining results, many different le...
Kalzium
[10 users on Ohloh]
Kalzium is an application which will show you some information about the periodic system of the elements. Therefore you could use it as an information database. It also includes an equation solver and 3D viewer for molecules.
eLML (eLesson Markup Language)
[9 users on Ohloh]
The eLesson Markup Language (eLML) is an open source XML framework for creating structured eLessons using XML. Thanks to a clean separation between content and layout eLML lessons can be transformed into many different formats and layouts. It supports the following output formats: XHTML, IMS Content Package, SCORM, PDF, LaTeX, Open Document Format (ODF) and DocBook. The framework has been successfully tested with many different LMS like Moodle, OLAT, WebCT/Blackboard and Ilias. A number of tools...
Moodle (lang)
[9 users on Ohloh]
Moodle is translated into over 70 languages by a dedicated corps of worldwide volunteers.

Translation has actually been going on a lot longer than the stats here may suggest, because the language packs used to be part of the main Moodle code base.

Sugar
[9 users on Ohloh]
Sugar is a learning platform that reinvents how computers are used for education. Collaboration, reflection, and discovery are integrated directly into the user interface.