Today lots of apps use a huge variety of different options for menu elements. They could be side bar, tab bar or a button that expands to a few other ones. The style of the menu depends on the idea of the app and the navigational aspects of the app. Fortunately, there is a group of app developers who were generous enough to develop some open source UI libraries with these elements and they shared them on Github.
We dig into the archives and find some UI menu libraries. In first chapter we show you Android Libraries (later we show you iOS libraries). Here they are: