Both are FREE!

1. BBC Learning English
http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/

There are many news articles covering various topics like economics, geography etc. A podcast is provided for every article. Useful words and phrases are in bold, with the meanings and pronunciations in the same webpage.

I think it is useful for teachers to use in class to teach reading, oral, grammar. Moreover, these are authentic materials.

2. Free Rice
http://freerice.com/

The first page to appear would be English Vocabulary. Students pick the right synonym and for each correct answer, the sponsors donate 10 grains of rice to the United Nations World Food Program.

If you want to assess students' grammar skill, then click on Subjects at the top bar and select English Grammar. However, there is no specific section like Tense, Nouns etc.

I think this site can be used for students to work in groups and compete against each other. Students can listen for the pronunciation and write notes.

Learn + Fun + Charity!