This is a list of 25 or so websites and apps that are useful for teachers. These are the ones we are actually using in our classrooms - some on iPads, some just for the teacher.
This is a list I would give out to college Education classes for ideas.
NOTE: My free products are not free samples of paid products. Rather, they are products that I think are simple and basic enough that they aren't worth charging $.50. They may not be creative or have a lot of instruction - they are just simple items that I am happy to share for free. :)