AUR Repository contains many software and packages available for Manjaro system. This is a community based repository but I recommend all Manjaro users to enable this repository on their system. Here I will show you how to enable AUR repository on Manjaro 15.09. By default, this repository is not enabled.
Open Package Manager via Menu | System | Add/Remove Software. Then click Preferences from the menu button located on the top right side, below the close button. You will be asked to enter your root password to continue.