Free Grammar/Spell Checker: Language Tool:

https://languagetool.org/

 

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New York Public Library:

http://www.nypl.org/

 

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The New York Times:

http://www.nytimes.com/

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City Tech Library:

http://library.citytech.cuny.edu/

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Purdue OWL (Online Writing Lab):

http://owl.english.purdue.edu/owl/

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Wikipedia:

https://en.wikipedia.org/wiki/Main_Page

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Wiktionary:

http://en.wiktionary.org/wiki/Wiktionary:Main_Page

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