Monolingual dictionaries and thesaurus:

Cambridge English Dictionary

https://en.oxforddictionaries.com/

https://www.merriam-webster.com/

Thesaurus

Grammar, pronunciation, writing and more:

http://www.bbc.co.uk/learningenglish

https://owl.purdue.edu/

Newspapers:

The Local: Sweden’s News in English

The Guardian

The Independent

The Telegraph

Politico EU

https://www.huffingtonpost.com/uk

Things to watch and read:

https://www.ted.com/

https://aeon.co/

Things to listen to:

https://www.bbc.co.uk/radio4