Package ascii folds Unicode characters to their ASCII equivalents where possible.

Package contractions provides a filter to expand English contractions, such as "don't" → "does not", for use with jargon.

Package mapper provides a convenience builder for filters that map inputs to outputs, one-to-one.

Package stackoverflow provides a filter for identifying technical terms in jargon.

Package stemmer offers the Snowball stemmer in several languages.

Package stopwords allows omission of words from a token stream.

Package synonyms provides a builder for filtering and replacing synonyms in a token stream.

Package twitter provides filters to identify Twitter-style @handles and #hashtags, and coalesce them into single tokens.