Minecraft Canary is a portable encyclopedia with all essential info related to popular Minecraft videogame.
For those who don’t familiar with it, Minecraft is a sandbox game focused on creativity and building, allowing players to build constructions out of textured cubes in a 3D world. The game is divided into two main modes — free Classic and paid Beta — where Classic is focused entirely on construction with unlimited material supply, while Beta requires players to acquire resources themselves, contains mobs, player health, and additional features and items. You can read full story at the wikipedia page.
The main reason to use this app is complete lack of any help or tutorial inside the game itself. And you need to know a lot of things to play successfully, especially when it comes to crafting recipes. Minecraft Canary contains all of the needed knowledge (or database) in one place with illustrations and detailed descriptions. It might need some design tweaks, font-wise for instance, but overall it is great already.