Parsers for English

• Connexor Machinese Syntax and parser
• C&C parser for Combinatory Categorial Grammar
• DELPH-IN, Deep Linguistic Processing with HPSG (Head-Driven Phrase Structure Grammar)
• Link Grammar Parser -- a dependency parser from CMU. The latest, supported versions are hosted here, at Abiword. Open source, BSD license.
• Minipar
• OpenCCG parser and grammar development environment for Combinatory Categorial Grammar
• Shalmaneser
• Spejd - Shallow Parsing and Disambiguation Engine a GPL tool for simultaneous partial parsing and rule-based morphosyntactic disambiguation
• Syntactic dependency parser for English

Non-English Parsers

• VERTEX - A chart parser for unification grammars (French)