Auto Clicker is a free tool that allows you to make your mouse automatically click after an interval of time which you can set.
How to use:

1. Install the tool and run it.
2. Type your desired interval.
3. Type the no. of clicks that you send. If you want to send it for unlimited no. of times, type 0.

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Click Start Clicking.

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If you want to enable/disable clicking from a hotkey, click None, type your hotkey and click Assign.

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Now it will make your mouse automatically click after the interval of time that you have set.