In your smartphone or tablet, Android or iOS, you can open Settings and choose WiFi, to see the WiFi available within reach of where you currently are. This is your native WiFi manager.
Native, because it is built into your device. Manager, because you can manage your WiFi settings from that list.
Instabridge for Android is an alternative WiFI manager that helps you connect to WiFi within reach. Instabridge on iOS will help you connect to WiFi through opening your native WiFi manager and clicking on any WiFi with the text "Connect with Instabridge."