Pixelmator is one of the best photo and image editing apps that you can buy on iOS.

Inspire Pro — Paint, Draw & Sketch' van KiwiPixel

Inspire – Paint, Draw & Sketch for the iPhone / iPod Touch / iPad for FREE

Super Notes: Recorder, Note, Memos, Photos. Notebook plus Notepad.' van Clear Sky Apps LTD

Notes: Supernote Recorder, Notes, Photos Notepad on the App Store

Notities Note-Ify: Kleurrijke notities met Reminders, TextExpander en Dropbox synchronisati' van Sergii Gerasimenko

Notes Note-Ify: Colorful notes with Reminders, TextExpander and Dropbox synchronization by Sergii Gerasimenko

Video Filters - The Pro Camera Photo Effects and Pro Zoom Slow Motion Stabilize Stereo Audio Videos App on the App Store

SampleTank' van IK Multimedia

SampleTank is a powerful sound library with lots of goodies. SoundPrism or Geo Synth. It also has a recording section, which I haven't used with students (yet).

Duke Nukem: Manhattan Project' van Spawn Studios, Lda

Duke Nukem: Manhattan Project on the App Store

Eden - World Builder' van Kingly Software Inc

Eden World Builder - bygg landskap och byggnader med olika typer av block

Video Slimmer App - Video editor tool to shrink, trim, merge, cut, split, rotate videos to save storage space for movie file' van Shenzhen Socusoft Co., Ltd

Video Slimmer: Shrink, trim, merge, rotate movies on the App Store