I recommend...
Grammar web pages:
English Exercises (you need to register)
On You Tube:
Learn English with Let's Talk - Free English lessons
https://www.youtube.com/user/ShawEducation
https://www.youtube.com/user/oxfordonlineenglish
News in English:
If you like singing:
English culture:
Short Video documentaries about Britain and the USA
Free Podcasts and video lessons:
Listen to English - Learn English!
Randall's ESL cyber listening lab
PDF with more listening resources
Learn with short film videoclips ( www.learnenglishfeelgood.com)
English Listening Lessons Library
Useful phrases & Vocabulary lists:
General:
Agenda web (english on line exercises and printables)
Aprende mas inglés (Learn English pronunciation, grammar, vocabulary... from an American Teacher who lives in Madrid)
Aprende inglés con Sila (Just the other way round, a Spanish teacher's web who has lived in London)
Tests
Test Your English (listenings, grammar, writing tests...)
For teachers...
TeachEnglish, British Council: https://www.teachingenglish.org.uk
https://justificaturespuesta.com/
CLIL:
https://www.pinterest.es/mrosasalo/clil/
https://www.schoolingamonkey.com/science-experiments-for-kids/
https://www.worldofchemicals.com/455/chemistry-articles/chemistry-in-everyday-life.html
https://kids.nationalgeographic.com/
Other webs i recommend...
Project Based Learning - Edutopia
Technology Based Learning - Edutopia
Educational Technology and Mobile Learning