There are legitimate apps available that can help you find free Wi-Fi networks in certain areas like cafes, restaurants, libraries and other public places.

These apps can provide you with information about the availability of nearby Wi-Fi networks and their connection details, but they don't unlock private network passwords.

Some examples of apps that help you find free Wi-Fi networks include:

1. Wi-Fi Map: This application has an interactive map with passwords for free Wi-Fi networks around the world, shared by users.
2. Instabridge: This app allows users to connect to nearby free Wi-Fi networks shared by other users.

It is important to remember that when using public Wi-Fi networks, it is recommended to take precautions to protect the security and privacy of your data, such as using a secure connection (for example, through a VPN) when accessing confidential information or transacting online.