We provide a tokenizer, a part-of-speech tagger, hierarchical word clusters, and a dependency parser for tweets, along with annotated corpora and web-based annotation tools. Contributors: Archna Bhatia, Dipanjan Das, Chris Dyer, Jacob Eisenstein, Jeffrey Flanigan, Kevin Gimpel, Michael Heilman, Lingpeng Kong, Daniel Mills, Brendan O'Connor, Olutobi Owoputi, Nathan Schneider, Noah Smith, Swabha Swa