Learning ESL / EFL Using Smartphones | TeachingEnglish | British Council | BBC:
"Dictionary.com: This app delivers reference content from Dictionary.com and Thesaurus.com. The app also features audio pronunciation, voice-to-text search, and Word of the Day. It has 375,000 words and definitions, over 300,000 synonyms and antonyms, phonetic and audio pronunciation, spelling suggestions, example sentences, favourite words list. My students and I have found the application immensely useful.
Test your English: This app is at three levels: Test Your English I, II, III. It helps the learner improve their English skills. Each level contains more than 900 multichoice tests. The types of tests are: ESL/EFL grammar exercises, ESL Business English tests, English synonym worksheets, idioms tests, common errors in English tests, etc. There are also many interesting reading passages through which English grammar can be learnt in a fun way.
250 Grammar Quizzes: This app consists of 250 basic grammar questions. Each test contains five questions. It helps learners understand English grammar better.
Crosswords: This application lets you download and solve crossword puzzles from around the world. New puzzles are available every day from major newspapers, plus hints, clue listings and many more."