BusyTeacher contributor Susan Verner has shared a list of top 10 websites for ESL teachers.
You may already be familiar with the following websites, or this might be your first introduction. Either way, each of them can be a ready resource for your ESL teaching needs and a way to freshen your teaching plans and answer your questions.
Every ESL teacher has to teach grammar, even if that is not one of your course names. This site lists the grammar rules of English alphabetically, and they are easily accessible. Not only that, they provide PDF files of lessons on these rules that you can use with your students.