Today there are 15 amazing free apps that are available for a limited time! The first couple of math ones are great tools to help students struggling with math. Afterwards most of the apps go into the world of elementary. There is a really neat dyslexia tool for the special education folk out there too!
Check them all out here: 15 Amazing Free Apps via OneTab
I came across another free app as I was downloading these for my school districts, Sago Friends!