I know a lot of folks here are familiar with a range of apps / applications. I'm looking for an app (iPad) or application (Windows 8.1 on a touchscreen, this is perhaps preferable) which allows me to free-form annotate text. A good example is what you see John Piper doing in his new Look in the Book videos:
http://www.desiringgod.org/labs/free-in-christ-jesus
In short, I would start with typeset text, e.g. a passage of scripture. Then I want to be able to "draw" circles around words or phrases, draw lines to connect words or my circles, write short comments, etc.
Any recommendations? Thanks,
Donnie