Internet Grammar of English
The Internet Grammar of English is an online course in English grammar written primarily for university undergraduates. However, it will be useful to everyone who is interested in the English language. Brought to you by University College, London.
Online English Grammar
A truly outstanding site that gives in-depth explanations for a vast variety of grammar questions.
English@Home
Learn English grammar, vocabulary, verbs and speaking with games, an English newsletter and more.
List Of Irregular Verbs
A list of irregular verbs online.
Interactive Exercise About Irregular Verbs
An interactive way of learning irregular verbs. Especially useful for German-speaking learners of English.
ESL Language Learning (Update (11/9/2008): unfortunately, this resource is now password protected.)
Richard Williams' archive of online exercises. You will find just about everything from reading to writing, from listening to speaking.
English Exercises Online
Good site with exercises for learners including vocabulary, grammar, reading comprehension and spelling exercises with RealAudio.
Do you know any other useful online resource dealing with English grammar (exercises)? Please let us know about it by leaving a comment.