"An annotated collection of grammar and writing resources from around the web" (deck, 2014.11.07).
In this post, Kershner explained two hands-full of grammar points on which prescriptions and usage often are at odds.
"We might be tempted to suggest Grammarly for students or learners of English, but the fact that Grammarly has nothing to say about so many of our intentionally incorrect sentences leads us to the sad conclusion that Grammarly is useless for everyone. Grammarly might improve, but as of early 2012, we can’t in good conscience keep advertising it on our site." (Conclusion, ¶2)
英語・TOEIC・英検の学習法、無料教材の提供サイト
Japanese site with resources for studying English grammar and vocabulary, and preparing for STEP Tests, the TOEFL, and the TOEIC
Irregular English verbs: conjugation chart with audio and glosses, plus link to example sentences page (6に進む) and site index
"Grammar-Quizzes.com is an open educational resource for understanding, learning and practicing English grammar through the use of current event stories, pictures, contrastive grammar points, sentence diagrams, and self-quizzes. Originally written for intermediate non-native speakers, Grammar-Quizzes now includes practices for native speakers" (Mission, ¶1, 2012.03.26).
"Grammar-Quizzes.com is an open educational resource for understanding, learning and practicing English grammar usage. These materials present simple grammar concepts and are most appropriate for non-native speakers, but also include practices that could be used for K–12 native speakers" (Mission, ¶1, 2012.01.05).
This is "a collaboratively edited question and answer site for linguists, etymologists, and serious English language enthusiasts. It's 100% free, no registration required" (Welcome! 2011.02.02).
For learners of English, sports posts in various categories: adjectives, grammatical expression[s], grammatical word[s], idioms, phrasal verbs, and the difference[s] between words (Categories, 2011.02.02)
Thanks to Nik for pointing this out in <a href="http://quickshout.blogspot.com/2010/11/get-students-checking-grammar-and.html">Get Students Checking Grammar and Collocation</a> (Nik's Quick Shout, 2010.11.25).