Oxford University Press ELT.

Oxford Learner's Academic Dict
FreeOxford Learners Dictionary of Academic English...
AndroidOxford Phonics World
FreeLearn Phonics with The Oxford Phonics World app from Oxford University Press.
AndroidOxford Learner's Bookshelf
FreeLearn English with interactive coursebooks and Graded Readers from Oxford.
AndroidSay It: English Pronunciation
FreeImprove your English pronunciation today with Say It. Hear the Oxford model, see the soundwave, then record and compare your pronunciation.
Android
Oxford Learner's Dict.: Arabic
PaidComprehensive Arabic Reference Dictionary for Learners
Android
Oxford Learner's Thesaurus
FreeEnhance Your Vocabulary with Oxford Learner's Thesaurus
AndroidOxford Collocations Dictionary
FreeEnhance Your English with Oxford Collocations Dictionary
Android