This appliction let you run PocketMine-MP or Nukkit on your android devices. It's a plugin developer's tool, NOT a game server. If you don't know what's PocketMine or Nukkit, use this tool is not suggested.
FENGberd has created Pocket Server that falls into the Tools category. This application was downloaded and installed by over 100K users and its latest stable release was on Jul 1, 2017. People rated the app 3.9 on Google Play.
It's free of charge to download the .apk file of Pocket Server and you can have a look at users' reviews on Droid Informer. This application installation package requires 5 MB of free space to run on Android 4.0 and above. The app has been checked for viruses and it has been found totally secure.