This app was mentioned in 4 comments, with an average of 1.50 upvotes
I use rain alarm https://play.google.com/store/apps/details?id=de.mdiener.rain.usa.plus bought the full version with Google rewards money.
Take a look at Rain Alarm Pro.
https://play.google.com/store/apps/details?id=de.mdiener.rain.usa.plus
This little app just has simple lists, but auto-updates across multiple phones in near real-time. If you have a grocery list, your SO can update the list from their phone, and it'll get pushed to your phone right away. Much nicer that texts/calls to add something to the list.
A simple little app that shows you if it's going to rain or not. I like it a lot when I have my top down in my car and need to know if I have to run out and put it up.
I don't use the Cloud for backups, and instead have a server in my house. This little app will backup whatever FILES you want, whenever you want, with a variety of customizable rules.
This simple widget allows you to speak calendar appointments. So you can tap it and say something like "Dentist appointment Tuesday at 3pm" and it will put it into your calendar.
Scan in all your store rewards/points cards and pull them up easily with this.
Just a white noise machine, which has a lot of different sounds. It's great.