A free program for Android, by www.f1widget.com.

Wi-Fi Switcher is a free, reliable, and easy-to-use app for switching to Wi-Fi networks when the signal is weak. It will allow you to switch to a different network, even if the current network is available and you are connected to it. You don’t need to worry about losing your Internet connection or about paying for the data. The app is free to use and does not have any advertisements. You can use it on any device that is connected to the Internet.

How can it help me?

It can help you in two different ways. First, if you have a weak signal, it will help you to get a better signal. Second, if you are not connected to the Internet, it will help you to connect to the Wi-Fi network that you want to use.