BrainBites breaks your day up into hour blocks called "bites" and provides you with thought provoking questions throughout the day based on the topics you give it.
I created this to use personally because two nights ago I realized I didn't have someone to bounce ideas about my data company off of throughout the day.
Now I can get notification each hour that sparks new ideas and makes me think in ways maybe I didn't see.
Anyways, it's free. Hope you get some use out of it.