OpenCalais is the Open Source repository for the Calais project.
"Calais: Connect. Everything." 
We want to make all the world's content more accessible, interoperable and valuable. Some call it Web 2.0, Web 3.0, the Semantic Web or the Giant Global Graph - we call our piece of it Calais.
Calais is a rapidly growing toolkit of capabilities that allow you to readily incorporate state-of-the-art semantic functionality within your blog, content management system, website or application.
The free Calais Web service that has an open API. Users of the service can request 40,000 content transactions per day and a limit of 4 per second. Information and resources can be found at OpenCalais.com
Is the same service as OpenCalais, but provides more transactions and 24×7 monitoring. The daily transaction count is increased to a maximum of 100,000 and a limit of 20 per second. Additional transactions can also be purchased.
Calais Professional for Publishers
Is the professional option for large scale publishers. It also has an option to purchase the service as an annual contract.
Is the “enterprise software” version of Calais. Enterprises can install a customized version of Calais within the enterprise’s IT infrastructure. In addition to the functionality provided by the above options, enterprise users can create their own entities and relations in order to add information to the metadata that is generated by Calais.
Gist is an up-to-date archive of news articles that have been passed through Clearforest (third-party tagging service). By applying user-input, business logic, metrics/analytics and advanced UI, we hope to gain greater insight and meaning from the chaotic, information-overload generally associated with the news.
Gist is not edited by any person, we rely solely on the volume of tags to determine our top stories -- so if you feel that the incorrect story is highlighted, check back in an hour or two.
- GIST - Semantic News Source: http://gist.whistlehog.com
- Is OpenCalais Becoming a Search Engine?: http://blog.semantic-web.at/2008/03/31/is-opencalais-becoming-a-search-engine/
- OpenCalais Home: http://opencalais.com
- Reuters Leading the Semantic Web Charge: http://mashable.com/2008/09/24/reuters-semantic-web/