**For more grammar and editing work, please see the Grammar section***
A Guide to Tutoring Non-native speakers
This is a very wide resource of PDF worksheets for topics from organizing an essay, to note-taking, to grammar and editing.
No Red Ink
Free version and paid premium versions. Nice for drafting, grammar lessons and editing
This is a nice website overviewing typical writing errors. Nice for a review for students when you're at the editing stage of a paper.
Learning English with Michelle-Editing
Excellent site with so many editing topics from fragments and run ons to pronouns and spelling
This site has very short (as in 1-3 sentences) explanations anda then a short exercise. But it has every single grammar topic imagineable!
This is really an elementary spelling site, but it presents spelling rules, vowel and consonant pair practice very thoroughly and includes a game with every chapter.
Great handouts on every possible spelling concept.
Grammar quizzes Writing Introductions
Examples, definitions and exercises
Exercises for a variety of sentence combining.
Intermediate and advanced PDF exercises
Same site with online and downloadable exercises
Lots of word formation exercises
You can write and illustrate your own book, share online or buy a prepared copy. The site is targeting kids, but could be well adapted to any age.