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Grammar
Open source development package that helps you write BNF-style grammar in Ruby...
Link Grammar
Open source syntactic parser of English and other languages...
German Grammar
German Grammar provides a quick reference of basic German grammar....
Grammar Browser
Free and open source GUI interface to grammatical structure and relations...
edit gui grammatical relation editor import grammatical relation export grammatical relation
Russian Grammar 1.0
A comprehensive OS X utility that provides various grammar-related information about the Russian parts ......
reference grammar Russian grammar reference learn Russian grammar Russian pronunciation
Grammar and Punctuation
Fun grammar tutor for young learners...
Grammar Editor
A free tool for learning context-free grammars...
dk.brics.grammar
Finite-state automata and regular expressions for Java...