Quizes, games and worksheets generators:

• Kahoot!
• Quizizz
• Quizlet
• Wordwall
• LearningApps

Interactive boards generators:

• Genial.ly
• Padlet
• Trello

Mindmaps:

• MindMup
• MindMapMaker

Surveys, questionnaires, quizes on-line:

• Google Forms
• AnswerGarden
• Mentimeter

Presentations:

• Canva
• Prezi
• Slidely

Useful educational channels:

• FreeSchool
• Homeschool Pop
• It's Okay To Be Smart 
• Crash Course
• SciShowKids
• National Geographic KIds
• Minute Physics
• Mystery Dough
• Math Antics
• PBS Learning Media