The attached PowerPoint shows may software and hardware resources available to be used in a classroom setting. Many are free, but some have costs associated with them. Look for the EDU or Government building in the top left corner of the slides to indicate that service offers free or discounted education or governmental rates. Use this for your classroom to get an idea of what works best for your students and content.
Alternatively, use this to be a technology ambassador to other teachers in your school. I would suggest creating a login for as many of them as you can in order to have your teachers be your students as you present this to them. Do an example question or two to show the capabilities and limitations for each as some may work well for some, and not so well for others. For example, a math teacher may not want to use something locked to Multiple Choice and may would like to have any answer submitted.