Audio & Video Editing

Video Screencasting

Screencastify 

Loom

MiStreamNet

Flip!

Easy Video Editing

Binumi: Edit video based stories (has cost)

Kapwing: Create video based stories, using video, gifs and images

WeVideo: video editing online

Audio Creation & Editing

Soundtrap: Create songs, narrative and audio recordings online — even collaboratively

Voki: Create an avatar then record your voice as narration