Ideally, you would follow the recommendations of the WavTap developer and the Airparrot developer on how to uninstall their extensions.
But there are almost certainly files related to WavTap and Airparrot in the Extensions folder of the Library folder of the startup disk:
… which you can delete and then reboot in order to get rid of WavTap and Airparrot.
There may also be files at:
… but be very careful in there because if you delete the wrong thing you could cause your system not to be able to boot.