On his Wordlists page, @muranava has a curated selection of English wordlists, both general and subject-specific. Find information about the General Service Word List, the Academic Word List, as well as specific corpora and recent updates to available resources.
@muranava teaches EFL in higher education (engineering, business) in Paris, so some lists reflect that teaching context. He also runs a corpus linguistics community on Google+ with references, advice and updates on research and tools.
So, You Think You Can Teach ESL? 