Bottle opener is a tool which is used to open bottles.
Magnetic Bottle Opener
Victorinox pocket knife with bottle opener (and screwdriver) blade extended
Field knife and its sheath. The upper crossguard is bent forward and can be used as a bottle opener.
Churchkey from 3 angles
A Budweiser branded "bar blade", front and back
A wall-mounted bottle opener
Opened Waiter's Friend
A twin prong cork puller