Copyright free images:
https://www.photosforclass.com/
www.pixabay.com
Music and sounds:
netlabels.org
https://www.partnersinrhyme.com/
https://www.hoerspielbox.de/
English version: https://www.soundarchive.online/playing-electric-guitar-with-wah-wah-effect-4-2-10004-mp3-audio-sound-free-download-instruments-chordophone/
https://www.salamisound.de/
https://www.audiyou.de/freesounds/
http://www.orangefreesounds.com/
http://www.ccmixter.org/
https://www.jamendo.com/
https://soundcloud.com/
To edit audios, here is the free audacity download for you: https://www.audacity.de/
English version: https://www.audacityteam.org/download/
eMagazines:
www.calameo.com
interactive poster:
www.glogster.com
Work together on a text:
http://meetingwords.com
https://framapad.org/en/
Online voting:
https://www.tricider.com/
Quiz/Polls:
www.mentimeter.com
interactive pin board:
padlet.com
timeline maker:
https://timeline.knightlab.com/
wordcloud
wordart.com