It can be a delicate balance to try to not overwhelm students by the quantity of educational technology we use in a class, while still keeping things interesting through the element of surprise. The easier a tool is to use, the more likely students will feel comfortable engaging with each other.
As an example of the kind of tool that is easy to use, I was recently introduced to a brainstorming tool called Tricider (thank you Michelle Pacansky-Brock, faculty mentor for digital innovation at California Community Colleges).