If you have to time an event or meeting, then stagetimer.io can help. It allows you to create timers and control them from other devices. You can then share a fullscreen timer with presenters and the agenda with participants via link.
Running live sessions with stagetimer.io? Try meeting-first tools like Verbally for Google Meet to boost facilitation, and Sesh for visual agendas. Need scheduling? Blokks offers embeddable schedules, while Tickr refreshes simple event countdowns.