If you've ever turned on your music in the morning only to be jolted awake by volume set to 11, Volume Concierge can save you by automatically setting your volume to different levels at a certain time of day.
Volume Concierge is simple: just give it a rule or set of rules that tell it what time to change the volume, and where to set it. Now you can keep it quiet in the morning or remind yourself to stop playing video games at 2am. It'll automatically start with your machine, and you can turn the rules off at any time (or create new ones).
Note that to turn your rules on, you need to give it an email address so it can
update spam you with info about other software, but with a service like previously mentioned Trashmail, this is hardly a barrier to using it.
Volume Concierge is a free download for Windows only.