HTC has released HTC Scribble for the HTC One M8 in the Google Play Store. Scribble was originally available on last years HTC One Max. Scribble lets you capture your thoughts by creating and editing notes and drawing sketches. You can also add photos and animated GIFs. You can create several types of notes by choosing from a number of HTC's templates.
You can also do things like link a note with a calendar event. Create something for a friend's birthday, and quickly send it to them when you get birthday reminder from your calendar. HTC Scribble also features capacitive stylus support for handwriting and drawing.
HTC Scribble is available on the Google Play Store right now for free.