Grammar and Mechanics

The Blue Book of Grammar and Punctuation. Jane Straus's easy-to-use reference guide and workbook is now available as an online resource. Choose a topic from the Table of Contents, study the section, do the exercises, and take the test. Answers are provided for the exercises and tests.
http://www.grammarbook.com/

Grammar Bytes! Interactive Grammar Review. This site features an index of grammar terms, grammar rules, interactive exercises, handouts for teachers and students, and a site creator section which has additional exercises and handouts.
http://www.chompchomp.com/

Big Dog’s Grammar. A Bare Bones Guide to English. Select from a great variety of grammar topics. Big Dog includes an interactive self-test designed to test your understanding of the grammar points you have just studied. The site also provides a handy MLA Quick Guide with information on plagiarism and citing sources.
http://aliscot.com/bigdog/

Guide to Grammar and Writing. This site prepared by Capital Community College in Hartford, Connecticut, covers a wide array of topics. For each grammar topic, you will find an explanation, a PowerPoint presentation, and interactive quizzes for checking your mastery of the topic.
http://www.ccc.commnet.edu/grammar/

Fundamentals of English Grammar: Description and Use. Choose a chapter and select a sub-topic. After studying the material, check your mastery of the material with the interactive quizzes.
http://textant.engl.unr.edu/grammarbook/title.html