OBS can handle multiple cameras. Download and find out. It's free.
This page has moved to https://obsproject.com/kb/sources-guide.
obsproject.com
"On Windows, for a device to work with OBS the drivers needs to support DirectShow output. Since DirectShow is the standard output format for Windows, there's a good chance that this is what your device outputs. All major webcams and capture cards support DirectShow and will work with OBS.
To add your device, simply add the Source, open the properties and select your device from the Device drop down list."