The International English Language Testing System, or IELTS is an international standardised test of English language proficiency for non-native English language
Pearson Test of English (PTE) is an English language test for non-native English speakers who want to study abroad. It examines reading, writing, listening and speaking abilities.
Test of English as a Foreign Language (TOEFL) is a test for English aptitude at any level for foreign universities. Administered by non-profit organization ETS (Educational Testing Service)