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
Klib - Kindle & iBooks Highlights Manager
Project Gutenberg - Project Gutenberg offers free ebooks to download.
Clippings.io - Organize the notes you make on your Kindle