A great place that I have discovered for digital resources is on Edmodo. When you are logged into Edmodo, at the top of the screen, you will see a row of four icons on the upper left-hand side of the screen.
If you click on the compass-shaped one (Discover section) you will be directed to a page where you can search, by topic, through subject-based activities that other educators have loaded onto Edmodo. This is a great resource to check into because it is easy and the materials can be quickly obtained. Also, if you want to narrow your search, you can directly search for any activities that you might specifically be looking for. Check out the sample images below.