Ontos is a provider of tools that aggregate content that is semantically related to content that already exists on a website or blog. Their API returns semantic metadata in RDF-based formats for existing text content. The API uses natural langugage processing to recognize entities and the relations between them. With the API, uses can link their text content with metadata coming from over 500,000 web documents. Full documentation is not publicly available.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.