Company Mosa Motion Graphics LLC created these great apps:
Clips for iMovie, NYC for Final Cut, Zoo for iMovie, NYC VideoKit for iMovie, Prep for iMovie for iOS, London for Final Cut, Backdrop Clips FX, Shanghai for Final Cut, Backdrop Clips 3D, Clips 3D for iMovie, New York Time Lapse, Clips FX for iMovie, Prep for iMovie for iOS, SloMo for iMovie, LearnTV for iMovie, Green Screen Pro, VJ Loops, Clips FX Memes, NYC 4K for Video Editors, and others..