League of Legends: Library is a comprehensive guide/database of nearly many of the things in the League of Legends game.
This app has a module for items which lists each item in League of Legends, it's components, and the items it upgrades to. It has a module for champions which shows you each champion, the lore surrounding the champion and any recommended items. There's also a rune list, and a videos module. The videos module contains hand picked youtube videos about League of Legends.
The Lite version of LoL Library is limited in features compared to the pro version. The content areas are also limited in the lite version. Please purchase the paid version of LoL Library for the full featured app.