classroomscreen.com is a terrific way to set up various widgets on one screen for use throughout a class period.
Traffic light, timer, clock, work symbols, random name generator and the ability draw on a picture, such as a diagram of a system of the human body are all quick and easy to access.
You cannot save your setup, but it is quick and easy to do.
You can even set up 2 windows side by side if you have 2 groups!
Here's a quick video tutorial: https://www.youtube.com/watch?v=ePmzqHbK9vg
Give it a go!!