A new standard for making books. A universal chassis that can hold pages which can be easily cleaned from ink (or similar) and reprinted.
Track money using a code and a website. Discover its life, where it circulates and how many kilometers it moves away from you.
A city map to locate trees which you can carve something about love into them.
Compel all politicians to use only public transportation, public education and public health.
Check-in app esp. for health: Location (@doctor weekly), Task (take pill 1pm daily), etc. - friend maybe alerted if u dont, rewards if u do.