Classroom Management/Lesson Planning Smart Classroom Management is an excellent series of articles that address common classroom challenges. This site is full of uncommon sense. English for Everyone provides a mind-boggling amount of printable English worksheets. Jeopardy Labs allows users to create their own online Jeopardy templates without using PowerPoint. Wordsmyth makes creating vocabulary quizzes easy.
Pronunciation Rachel's English includes a comprehensive set of video pronunciation lessons that address both segmental and suprasegmental language features.
Reading Newsela allows teachers to distribute articles of varying difficulties to their classes after registering (free). Includes comprehension quizzes.
Listening English Central provides access to a wide range of videos of varying levels of difficulty after registering (free). Videos come with activities that encourage the acquisition of new vocabulary items. Elllo is another great free listening site. Listening exercises include transcripts and vocabulary/comprehension quizzes. Randall's ESL Cyber Listening Lab is another great listening site with quizzes and potential classroom follow up activities.
Grammar Grammar Bytes provides grammar videos, presentations and handouts. It also provides the most enjoyable interactive grammar exercises on the web. Azar Grammar includes an large compilation of teacher created resources for teaching grammar.