[rpedela]

I have found CoreNLP to be the best library for POS tagging, NER, etc and Gensim for word vectors and summarization. Others have recommended Spacy, but I have found it to be inferior to CoreNLP.

[nl]

Just noting that CoreNLP is StanfordNLP (for those who are unaware).

I think it is widely accepted that CoreNLP outperforms Spacy in terms of accuracy for POS and NER.

Spacy is very convenient and works well enough for most tasks. It can also load Gensim vectors.