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The Lemur Toolkit is a open-source toolkit designed to facilitate research in language modeling and information retrieval. Lemur supports a wide range of industrial and research language applications such as ad-hoc retrieval, site-search, and text mining. The toolkit supports indexing of large-scale text databases, the construction of simple language models for documents, queries, or subcollections, and the implementation of retrieval systems based on language models as well as a variety of other retrieval models. The system is written in the C and C++ languages, and is designed as a research system to run under Unix operating systems, although it can also run under Windows.

Rice University professor Richard Baraniuk explains the vision behind Connexions, his open-source, online education system. It cuts out the textbook, allowing teachers to share and modify course materials freely, anywhere in the world.

OpenMark is a computer-assisted assessment (CAA) system that has its foundations in computer-assisted learning. It was developed by The Open University, where it has been used by thousands of students, and is now released as open source software under the GNU General Public License

The GoodRelations ontology provides the vocabulary for annotating e-commerce offerings (1) to sell, lease, repair, dispose, and maintain commodity products and (2) to provide commodity services. GoodRelations allows describing the relationship between (1) Web resources, (2) offerings made by those Web resources, (3) legal entities, (4) prices, (5) terms and conditions, and the aforementioned ontologies for products and services (6). For more information, see http://purl.org/goodrelations/ Note: The base URI of GoodRelations has changed to http://purl.org/goodrelations/v1. Please make sure you are only using element identifiers in this namespace, e.g. http://purl.org/goodrelations/v1#BusinessEntity. T

A semantic web experiment with a focus on Ontology Visualisation and Querying.

Apache CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API. Among other features, it provides robust, incremental replication with bi-directional conflict detection and resolution, and is queryable and indexable using a table-oriented view engine with JavaScript acting as the default view definition language.

The goal of this project is to develop a Python tool to make an in-depth quantitative analysis about Wikipedia, generating graphics and statistical results for each language version of Wikipedia.

OpenEphyra is an open framework for question answering (QA). It retrieves answers to natural language questions from the Web and other sources. Visit http://www.ephyra.info/ for more details and information on joining this open research initiative.

SCRIBO - Semi-automatic and Collaborative Retrieval of Information Based on Ontologies - aims at algorithms and collaborative free software for the automatic extraction of knowledge from texts and images, and for the semi-automatic annotation of digital documents.

KnowledgeForge is a digital open knowledge community based around this site. It is built on the KForge system and aims to provide you with the facilities and tools to create everything from a new textbook to maps. The only requirement to host a project on this site is that it be open.

Araucaria is a software tool for analysing arguments. It aids a user in reconstructing and diagramming an argument using a simple point-and-click interface.

Belvedere 4.1 is designed to help support problem-based collaborative learning scenarios with concept and evidence moodels, and provides multiple representational views (tables and graphs) on those models. Belvedere was originally intended to help secondary school students learn critical inquiry skills that they can apply in everyday life as well as in science, but can be adopted to other applications as well.

Open Educational Resources are all about sharing. In a brave new world of learning, OER content is made free to use or share, and in some cases, to change and share again, made possible through licensing, so that both teachers and learners can share what they know.

NutchWAX ("Nutch + Web Archive eXtensions" ) searches web archive collections. The Web Archive eXtensions (WAX) include adaptation of the Nutch fetcher step to go against web archives rather than crawl the open net -- adaptation currently does Internet Archive ARC files only -- and plugins to add extra fields to the index that return an Archive Records' location in the repository, its collection name, etc.

OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles and markers loaded from any source. MetaCarta developed the initial version of OpenLayers and gave it to the public to further the use of geographic information of all kinds. OpenLayers is completely free, Open Source JavaScript, released under a BSD-style License

Higgins is a framework that enables users and applications to integrate identity, profile, and relationship information across multiple data sources and protocols. Higgins is organized into three main areas: Higgins Selector, Identity Services (i.e. Identity Provider and Relying Party code), and the Higgins Identity Data Service.