Dave's ESL Cafe
Dave Sperling describes his site as "the Internet's meeting place for ESL/EFL students and teachers from around the world." Resources include a chat room, FAQs, quizzes, and a Help Center.

ESL Study Hall
George Washington University recommends resources on reading, writing, grammar, vocabulary, U.S. culture, and listening.

English as a Second Language (ESL) Resources, Handouts, and Exercises
Purdue's Online Writing Laboratory offers an extensive collection of material on grammar, idioms, and writing style.

English for Non-native Speakers (ESL)
Recommendations from the University of Chicago's Writing Program direct you to text-based references or interactive quizzes.

ESL Slang Page
Look up a term from Dave Sperling's list or test yourself with a randomly-generated slang phrase.

Idiom Page
Find out what a specific idiom means or test yourself with a randomly-generated idiomatic expression.

Interesting Things for ESL Students
Check out the ESL Reading Room to find a Miranda Warning Jigsaw Puzzle and other unique ways to play with English.

Learning English: Words in the News (BBC)
Read news stories from the BBC and listen to difficult words. (Click on the Listen to the Story icon.)

Printable Charts and Tables
Evelyn Farbman provides quick guides to troublesome topics like verbs and prepositions.

Randall's ESL Cyber Listening Lab
Listen to RealAudio files of English conversations, provided by teacher Randall S. Davis. The FAQs explain how to use and troubleshoot audio files.

Ruth Vilmi's Grammar Help
A collection of useful resources on everything from pronunciation to grammar resources from Finnish teacher Ruth Vilmi.