- OpenCalais - 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
- Calais Professional - is the same service as OpenCalais, but provides more transactions and 24x7 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.
- Calais Enterprise - 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.
Of course, this news is right on the heels of the public launch of SemanticProxy.com. What Reuters has done is converted Semantic Web concepts into enterprise ready software. Given the struggles that semantic Web companies have in gaining user adoption, an old media company may be forcibly mainstreaming the technology. Paul Miller of ZDNet gives a good idea of what SemanticProxy can do as well as highlights the future in Linked Data:
"A tool like SemanticProxy makes it straightforward to generate structured metadata from pages on the open Web. Furthermore, it respects the Linked Data community’s ‘rules‘, and Tague stressed that;
'SemanticProxy will return dereferenceable Linked Data URIs by the end of this quarter.”
Reuters knows that they have not solved the problem, but they are hoping to start a trend:
"SemanticProxy is our attempt to jumpstart the semantic consumer end of the equation. We have all the standards we need. What we’re missing is a critical mass of semantically enhanced content.
SemanticProxy doesn’t solve that problem, but it can act as a catalyst."