If you have a smartphone, you might be concerned about apps that tap into the microphone or camera. These apps may also gather data from you and sell it to advertisers. You can block this by installing an app to monitor the microphone or investing in hardware that blocks microphone access. To spy on public video cameras, you can install iSpy, which is free and installs easily. The app allows you to view thousands of live video cameras and swipe back and forth between pages to see what’s being filmed.

While the app can monitor and record webcams and IP cameras, you’ll need some technical know-how to use it properly. Fortunately, iSpy can monitor these devices for free, and it can even record from IP cameras and DVRs. iSpy is one of the most popular open-source video surveillance applications available today. It works with most consumer-grade webcams. For even more flexibility, iSpy’s iSpy Cameras feature lets you view and control thousands of public video cameras in real-time.