https://toggl.com/
2) We switched to Clockify because it is cheaper for us. They have a "free forever" version.
https://clockify.me/
I preferred the Toggl UI. It also has a free version, but I think it was more expensive for the reporting we wanted.
What kind of team are you running, and what benefit does time tracking offer you?
https://wakatime.com
For non-engineers it seems they mostly use old manual time trackers like Toggl.