Appskull is a very light weight, high secure PHP application that built using popular PHP framework called Codeigniter (latest version). This application allows users to easily start building their dream web applications without worrying about building user authentication, user registration, user password reset, system settings, user settings and etc... features by themselves. Also this application built with lots of love and care so it's code base is very clean, organized, well commented. Also Appskull is highly scalable and easy to maintain due to it’s HMVC (Hierarchical model–view–controller) architecture and modular code base. And it's front-end designed by using latest Bootstrap version(v4.3.1). No any third party theme/template were used. So it’s very light, unopinionated and very easy to customize for suit your needs.