Writing resources

Books

• Swan, Michael (2005).  Practical English Usage, Third Edition.  London, Oxford.

Dictionaries

• Oxford Learner Dictionary

• Merriam-Webster's Dictionary

• Macmilllan Dictionary and Thesaurus

• Longman English Dictionary Online

• myCOBUILD

• The Oxford English Dictionary

Vocabulary Learning

• ludwig.guru 

• Wordnik

• linguee.es

• The Lake Superior State University Banished Words List

• Wikipedia Sports Idioms 

Vocab profilers, corpora, concordancers

• The Compleat Lexical Tutor

  • Vocabprofile

  • Concordancers

• The British National Corpus

• Princeton WordNet

• Google Books Ngram Viewer

Grammar

• The Online Writing Lab (OWL) at Purdue

• Capital Community College Guide to Grammar and Writing

• Wikipedia - English relative clauses

Readability

• http://www.read-able.com/

• http://www.online-utility.org/english/readability_test_and_improve.jsp

• http://raventools.com/blog/ultimate-list-of-online-content-readability-tests/

Summarizing

• https://www.tools4noobs.com/summarize/ 

• https://www.summarizetool.com/ 

Quizzes

• http://a4esl.org

• http://www.grammar-quizzes.com