For applications where you need a deadbolt with a thumb turn on the interior, but don't necessarily need a key cylinder on the exterior of a door, the Falcon D261M is a great solution. This lock does not have an emergency release on the exterior so you would not want to use in an application where the only emergency access is through the door.

Deadbolt with thumb turn on the inside and blank plate on the exterior.
Falcon D200 Deadbolt