Glose for Mobile - A social reader for ebooks, now on Android
Readwise - Effortlessly rediscover and organize your Kindle highlights
Ritual Essential for Men - The scientifically-developed multivitamin for men
Knotes - An efficient, beautiful Kindle highlights & notes manager
Project Gutenberg - Project Gutenberg offers free ebooks to download.
Clippings.io - Organize the notes you make on your Kindle