A free app for Android, by UNO do Brasil.

UNO Teams is a solution for field team management that allows you to easily manage the location of your team members, to exchange messages in real-time with them, and to collaborate with them in the same way that you would with your colleagues at your company. It is an integrated solution, meaning that it is a single application that manages all the devices, regardless of the type of device that you are using, and it is available for iOS, Android, Windows, and Mac.

The solution consists of two main parts: the server application and the client application for the user.