Softaculous is an Auto Installer program. Softaculous helps you to install free/opensource applications in a couple of minutes. A user can install an application available in Softaculous without having to download/upload/change any files.
Additionally, the developers of Softaculous have made it possible for users to choose the application they think is the best after showing them ratings voted by users who have already tested and used the app. You can also see demos of the applications. In short, Softaculous just helps you to install applications really fast.