Online lessons and interactive quizzes covering everything from parts of speech and punctuation through writing research papers. Includes PowerPoint presentations.

Good source of printable worksheets for English grammar or ESL teachers. Separated by skill level and topic, with additional tools including lesson plans, a teacher forum, and resource lists.
Includes some vocabulary activities.

Simple online lessons with quick quizzes on a variety of English grammar topics. Each lesson is also available in PDF format if printed materials are preferred.

Clear, printable worksheets in four levels from Cambridge's "new English course for teenagers." Remedial in nature, but great for either elementary level or reluctant learners in junior high or high school.

Online quizzes covering a variety of topics such as pronouns, verb forms, irregular verbs, comparisons, and particles. Formats included are multiple-choice, correct/ incorrect, matching, and more.

Scholarly, brief lessons with interactive, self-correcting quizzes immediately following the lesson. Choose topics from an organized directory in the margin and jump from topic to topic with ease.

Online English grammar handbook with topics divided into two categories: Grammar Rules and Punctuation & Capitalization Rules. Includes some online quizzes.

A collection of links to English grammar and vocabulary practice - online games from all over the web. Also includes links to listening skills practice, ESL materials, and English grammar software.

Much of the best from this site is available only with a membership, but some of the free resources include a grammar guide with examples, a guide to punctuation usage, and an assortment of online quizzes and games.

While mostly for ESL students and teachers, this site contains highly organized information on various grammar topics with some online quizzes over the information. Also check out their fun online games and helpful lists of adjectives, prepositions, and more.

Mostly for ESL instructors, but also useful for English grammar teachers. Includes brief grammar explanations by topic as well as online practice for each. Some writing assignment ideas and grammar exams included.

Again based on an ESL curriculum, this site features grammar tutorials and online activities for English grammar practice. Also includes printable worksheets, although these may need to be cut and pasted to be useful.

A useful list of links divided by topic like a Yahoo! directory, with sites classified by three levels of difficulty: kids, teens, and mature teens.