What are some alternatives?
When comparing Cop-Out and WFH Ninja, you can also consider the following products
Excuse generator - Don't want to go to office? They are here to help.
Date Checkup - Schedule fake calls and messages to rescue you
Netflix Hangouts - Watch Netflix at work by faking a conference call
RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
World Cup Calendar Blocker - Add lies to your calendar so you can watch the game
Faker - Faker is a PHP library that generates fake data for you