The best alternatives to Redbooth are Atlassian, Time To Estimate, and Scrumhub. If these 3 options don't work for you, we've listed a few more alternatives below.
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You might have been in video calls where hands are cut off or there's horrible lag. You’re moving your fists, rock-paper-scissors style, to your scrum lead's countdown only for everyone to estimate at the wrong time. TTE is the solution! Simple and fun.
This is a simple time tracker in which you can estimate your tasks by optimistic and pessimistic times. And also receive notifications when the time is up.