Longman Dictionary of Contemporary English: phonetics clearly stated, with recordings with several speakers. Countable / uncountable status. No institutional access required.
British Council: besides grammar flashcards and vocabulary lists, the site has, in the “general English” tab, many audio-visual documents with transcripts and activity suggestions.
British Library teaching resources: historical documents with proposed activities for pupils of various ages.
No Fear Shakespeare: Shakespeare’s plays along with translations into modern English
Audio-visual raw material
Animated Tales: 12 plays by Shakespeare adapted into 25 minute cartoons by various artists, originally produced by the BBC in the 1990s
In Our Time BBC Podcasts
Games and quizzes
The British-Irish Dialect Quizz: quizz created by the New York Times which maps local lexical variations