super-useful backchannel service TodaysMeet comes NextUp. NextUp is a free service that is designed to help you keep your meetings moving at the pace you planned.
To use NextUp just go to the site, title your meeting, and start entering the key transition moments in your meeting. After entering the transition moments you can set times for each of them. When the meeting starts, click "start" on NextUp and NextUp will count down the time to each transition.
Applications for Education
NextUp could be a good little tool to help you help your students stay on task during a series of classroom activities. Set up the transition times then start the count-down and tell students that when NextUp changes they need to move on to the next activity too.