Purrli is one of those internet things you didn't know you needed, but immediately you can't live without it. Purrli.com lets you create a custom cat purr, and is absolutely purrfect for background noise during a long day at work away from your favorite feline friends.
The most entrancing part of the site is the breadth of customization, allowing you to make a unique purr suitable for any need.
Need to boost your energy? Max out the Happy, Lively and Overjoyed settings. If you're looking for more of a relaxing deep focus vibe, move the scale toward Relaxed, Steady and Sleepy (maybe not too much if you're at work).
A purr generator is a breakthrough for folks like me who spontaneously combust around cats in real life, but still love and appreciate them from a distance. For my own health, this is probably as close as I'll be getting to a kitty anytime soon.