This is great. Years ago I used to help out at Honey Bee Network http://www.sristi.org/hbnew/ and saw hundreds and hundreds of innovative solutions by people from all over India. If you can navigate the rather clunky interface at the website, there's a lot of great solutions for problems that millions of people in low-income population face.
Here are some: Motorcycle cultivator http://www.sristi.org/hbnew/hb_inno_detail.php?ID=DTP0010000...
Bamboo bicycle http://www.sristi.org/hbnew/hb_inno_detail.php?ID=KNW0020000...