Useful Teaching Resources

This is my favourite for grammar. The Internet Grammar of English is an online course in English grammar written primarily for university undergraduates. It does not assume any prior knowledge of grammar.
http://www.ucl.ac.uk/internet-grammar/

As you would expect Wikipeida covers traditional grammar thoroughly.
http://en.wikipedia.org/wiki/Traditional_grammar

Maquarie Uni offers this robust and rich resource for ESL teachers
http://www.nceltr.mq.edu.au/eslsites.html

This is designed for students who haven't been taught formal grammar at school, and find that the study of medieval literature at University level requires basic language skills that they don't have. Produce by Wessex Parallel WebTexts.
http://www.soton.ac.uk/~wpwt/notes/grammar.htm

In A Look at Traditional Grammar Professor Einarsson, the author of English Grammar Handouts - A textbook on The Sentence Style of Classic English Writers talks about tradional grammar and prescriptive grammar.
http://www.classicalco-op.com/co_op_new/ce_tiki/tiki-read_article.php?articleId=26

The basic elements of English: an interactive guide to Grammar comes from by the English Department at the University of Calgary.
http://www.ucalgary.ca/UofC/eduweb/grammar/

HyperGrammar is produced by the Writing Centre at the University of Ottawa. This resource is available now only from the Internet Archives.
http://web.archive.org/web/19990209100641/http://aix1.uottawa.ca/academic/arts/writcent/hypergrammar/

online grammars Selection Of On-Line Grammar Books By Mt Naves http://www.ub.es/filoan/DG1mtgram.htm