Parsers for English

For languages other than English, see List of resources by language.

Free software

ASD grammars and parser
Bikel Parser
BLLIP (Charniak and Johnson) Reranking Parser
DELPH-IN, Deep Linguistic Processing with HPSG (Head-Driven Phrase Structure Grammar)
Link Grammar Parser - dependency parser from CMU. The latest, supported versions are hosted here, at Abiword. Open source, BSD license.
MSTParser - graph-based dependency parser originally by Ryan McDonald. (CPL)
OpenCCG parser and grammar development environment for Combinatory Categorial Grammar
Spejd - Shallow Parsing and Disambiguation Engine a GPL tool for simultaneous partial parsing and rule-based morphosyntactic disambiguation
Shalmaneser (GPL)
Stanford Parser (GPL)