Grammarist
Have you ever used the word "flaunt" when you meant "flout"? Unsure about the difference between "affect" and "effect"? This cleanly laid out reference site provides an alphabetical list of commonly confused word pairs, with explanations of appropriate usage. Other features include a list of idioms with their meaning and history, and basic rules of grammar and spelling.
Source: http://grammarist.com/
Categories: Reference Sites