Airbnb tools for managing multiple listings

[Rick Baggenstoss]

I have three listings and several more in process, so selfishly, I wanted to start a thread where we comment on off the shelf software tools and best practices for managing listings when you have several or many.  

Let's start with tools for managing communication with all parties.  Who is using something outside of Airbnb/VRBO?  What do you like about it and how was it to set up?

Feel free to ask about other tools for managing multiple listings too!