SimpleTasks is a basic to-do list app for Android programmed in C#, and designed with Google's Material Design in mind. It allows users to add a task to a list, view the task, and remove the task when it is complete.
If you have a busy schedule and have many things to do in a day, this simple app is perfect. Sure, you can use Google's built in Tasks app if you need complex functionality, but if you just want a easy to use and simple to-do list, this app is perfect for you.