Here you will find links to websites with information about or practice in developing listening skills.
An excellent site with many listening exercises for all levels of learner.
This page has an index of "some of the best apps out there for learning and practicing English ", including several that provide listening practice.
A British Council site with listening practice activities at various difficulty levels.
Listening advice and lots of things to watch and listen to. From EnglishClub, which has much more of interest on its site for English learners.
On this IST IST = International School Tutors site there are various quizzes to practise and test your listening skills.