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Most of the really good applications are part of larger systems. Parsing is good in machine translation, for instance. You transform the source text so that it's closer to the target language. Parsing is also useful for question answering, information extraction, text-to-speech...

Here's an example of using information from a syntactic parser to decorate words, and create an enhanced bag-of-words model: https://spacy.io/demos/sense2vec

Here's a very terse explanation of using them in a rule-based way: https://spacy.io/docs/tutorials/syntax-search