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Hi Mario, thanks for your interest in LT. I'm not sure I understand your question, do you simply want to use LT locally, then you can download it from languagetool.org. Or are you a developer and do you want to add support for a new language? That's documented at http://wiki.languagetool.org/adding-a-new-language.
I wanted to deploy languagetool to my website,for this i want to test it locally by sending text to languagetool server,is it possible?
I see - this is documented at http://wiki.languagetool.org/integration-on-websites. For testing, you can use the public HTTP API, i.e. make the proxy point to it (documented at http://wiki.languagetool.org/public-http-api).