Alarm and Shutdown is a very simple, yet handy addon (plugin) for Blender 3D Software, that allows you to set custom sound alarm, shut-down your computer by timer and send an email notification on render completion event.
Here you can choose from two major versions: either for Blender 2.79, or for Blender 2.8 (which is currently in beta stage)
The addon is completely free of charge, but if you'll find it useful, don't be shy to "buy me a coffee", I'll appreciate it and will be motivated to share useful stuff in the future (and trust me - there is more to come ;) )
A little text tutorial can be found here:
Thank you and Happy Blending!