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"RubyGems.org is the Ruby community's gem hosting service. Instantly publish your gems and install them. Use the API to interact and find out more information about available gems. Become a contributor and enhance the site with your own changes."

"conTEXT allows to semantically analyze text corpora (such as blogs, RSS/Atom feeds, Facebook, G+, Twitter or SlideWiki.org decks) and provides novel ways for browsing and visualizing the results. Read More... Try it for free "

"Semantic MediaWiki (SMW) is a free, open-source extension to MediaWiki - the wiki software that powers Wikipedia - that lets you store and query data within the wiki's pages. Semantic MediaWiki is also a full-fledged framework, in conjunction with many spinoff extensions, that can turn a wiki into a powerful and flexible knowledge management system. All data created within SMW can easily be published via the Semantic Web, allowing other systems to use this data seamlessly."

Numenta.org Platform for Intelligent Computing The mission of this project is to build and support a community interested in machine learning and machine intelligence based on modeling the neocortex and the principles upon which it works.

SMW+ is a semantic enterprise wiki. SMW+ is well suited for organisations or teams dealing with complex and informal workflows. SMW+ offers a rich feature set to create, share, publish and re-use knowledge contained in wiki contents. 

MLbase: A User-friendly System for Distributed Machine Learning. Machine learning (ML) and statistical techniques are key to transforming big data into actionable knowledge. In spite of the modern primacy of data, the complexity of existing ML algorithms is often overwhelming-many users do not understand the trade-offs and challenges of parameterizing and choosing between different learning techniques. Furthermore, existing scalable systems that support machine learning are typically not accessible to ML researchers without a strong background in distributed systems and low-level primitives.

Semantic MediaWiki (SMW) is a free, open-source extension to MediaWiki - the wiki software that powers Wikipedia - that lets you store and query data within the wiki's pages. Semantic MediaWiki is also a full-fledged framework, in conjunction with many spinoff extensions, that can turn a wiki into a powerful and flexible "collaborative database".

An EdTechTeacher.org video tutorial on using

Wandora's Freebase extractor makes an request to the Freebase API and converts the response to topics and associations. As with all other data in Wandora the extracted topics and associations may be modified, merged and visualized with the tools provided in Wandora.

Super Stream Collider (SSC) is a platform, which provides a web-based interface and tools for building sophisticated mashups combining semantically annotated Linked Stream and Linked Data sources into easy to use resources for applications. The system includes drag&drop construction tools along with a visual SPARQL/CQELS editor and visualization tools for novice users while supporting full access and control for expert users at the same time. Tied in with this development platform is a cloud deployment architecture which enables the user to deploy the generated mashups into a cloud, thus supporting both the design and deployment of stream-based web applications in a very simple and intuitive way.

4store, an efficient, scalable and stable RDF database

GroupMe is a social tagging system where you can organize your bookmarks in groups of a certain topic and share them with other people. It has has an intuitive and fancy user interface. If you want to know more about GroupMe! and its benefits then come around here ..

"With a redesigned fully distributed API, HDFS integration and a wide range of new machine learning toolkits, GraphLab is now faster, more scalable, and more powerful than ever before."

Callimachus - The leading Open Source platform for navigating, managing, and visualizing applications using the Web of Data. Use Callimachus to create and deploy mobile and Web apps using open data and enterprise content using open Web standards. Data-driven applications made easy!

DERI Pipes: Open Source, Extendable, Embeddable Web Data Mashups Inspired by Yahoo's Pipes, DERI Pipes is an engine and graphical environment for general Web Data transformations and Mashup.

This project aims to open up the semantic web to a wide audience through novel techniques that allow viewing and editing of semantic web representation languages in ordinary natural language, as opposed to the methods currently used, such as source coding or graphical interfaces, which require significant training.