buzz is a library for parsing and analysing natural language.
It relies heavily on pandas, numpy, and occasionally NLTK. Constituency parsing can be performed with either benepar or bllip. Dependency parsing is done by spaCy, and dependency searching is handled by a purpose-built library called depgrep.
A general introduction to buzz is available via GitHub. This site provides more comprehensive documentation.
For the web-app based on buzz, called buzzword, head here.