Yes, in a hurry (I was just looking through the menu of installed applications) I have forgotten to mention:

ssh client and server;

espeak (text-to-speech);

Classic Cam, a camera app that "develops" photos to give them a "retro" look, much the same as those old 70's prints.

Guitar Chords; shows different kind of chords for a six string guitar;

Imagemagick, set of programs to manipulate various image formats;

theremin, a musical instrument which changes pitch and volume continuously, similarly to real theremin, depending on what screen area you tap;

live focus (for camera; allows you, as one of the features, to turn on/off white and red LEDs of the camera; can function as a torch, without interfering with photographing).