GoodNotes - GoodNotes lets you take notes and annotate PDF documents.

Stylus Labs Write - Write is a word processor for handwriting, designed primarily for tablets with an active stylus.

Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.

Write Pad (Sketches & Notes) - HAND WRITTEN NOTES   Write notes, Using your Finger OR  Using an Stylus and Carry Your Notes  with You wherever you go .

xournal - Lightweight notetaking and sketching app.

Journal - Organize all your ideas