OpenNLP is.... well I've never heard of anyone using it (except once in a ensemble). I think NLTK is more widely used.
Stanford CoreNLP give good accuracy and is pretty much the benchmark in English for accuracy. BUT it isn't great software. It falls over if you pass large amounts of text to it, the code is dreadful, it's hard to integrate (even in Java because of its own wacky config system), various parts aren't integrated (eg, SUTime), it doesn't have an embedding representation and it is pretty slow.
Having said all that I still use it sometimes. But Spacy is much nicer to use, and 99% (probably more) of the time the slightly lower accuracy is offset by things like the easy availability of word embedding right with the word tags.
I think it's pretty fair to say Spacy is the leading open-source NLP tool.
Stanford CoreNLP give good accuracy and is pretty much the benchmark in English for accuracy. BUT it isn't great software. It falls over if you pass large amounts of text to it, the code is dreadful, it's hard to integrate (even in Java because of its own wacky config system), various parts aren't integrated (eg, SUTime), it doesn't have an embedding representation and it is pretty slow.
Having said all that I still use it sometimes. But Spacy is much nicer to use, and 99% (probably more) of the time the slightly lower accuracy is offset by things like the easy availability of word embedding right with the word tags.
I think it's pretty fair to say Spacy is the leading open-source NLP tool.