I have been using the free tier (50K API calls per day) of Open Calais for years and have also used it in code examples in three books I have written.
One thing that Open Calais does that I really like is that they attempt to have a single URI uniquely identifying recognized named entities. This is useful because, for example, when it recognizes President Bill Clinton, you get a reference to a unique URI, even if his name, title is different in different processed texts.
Thomson-Reuters bought ClearForest several years ago, thus acquiring Calais. If you are interested in text mining, and if you haven't experimented with Open Calais, then please put that on your TODO list.
One thing that Open Calais does that I really like is that they attempt to have a single URI uniquely identifying recognized named entities. This is useful because, for example, when it recognizes President Bill Clinton, you get a reference to a unique URI, even if his name, title is different in different processed texts.
Thomson-Reuters bought ClearForest several years ago, thus acquiring Calais. If you are interested in text mining, and if you haven't experimented with Open Calais, then please put that on your TODO list.