You'll have to be a bit more specific - Integration of what to what?
Life should NOT be a trip to the grave with the intention of arriving safely in an cool and well preserved body, but rather to skid in, chocolate in one hand, beer in the other, body wrecked, totally worn out and screaming WOO HOO what a ride!
The same tools that you use for your verification testing can be used for integration testing. The only difference is that the scripts that you might design are specific to integration testing but the tools is the same.
During the validation process, you will be more detailed in what's tested but in integration you are making sure that all the software modules integrate with each other. The testing during integration is not as deep as in validation/verification.