New Add-on Render Strip is introduced to Blender Users today. Render Strip will help you render with multiple cameras in just one click, instead of setting each one every time before hitting Render.
How to use it:
1. Create new strip by clicking on New Strip.
2. Specify the camera, start frame and end frame.
3. Hit Render
This addon is open-source and free to download. Check it out now
Are you looking for more add-ons? Click here to learn some
Source: Blender Nation