When comparing NoSleep vs AppTrap, the Slant community recommends AppTrap for most people. In the question“What are the best Mac OSX apps for someone that's new to Apple?” AppTrap is ranked 18th while NoSleep is ranked 26th. The most important reason people chose AppTrap is:
AppTrap installs a daemon that runs in the background monitoring the trash, when you drag an app to the trash it will search for associated .plist files that have been left behind and ask to move them to the trash. In other words, AppTrap launches and does the work for you automatically. All you have to do is uninstall apps the old fashioned mac way by dragging apps to the trash.
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Pros
Pro Lets you close the lid of a laptop
The laptop will not sleep even if you close the lid, but the display will sleep. If your display cannot sleep, simply lower the brightness until it goes dark & turns off.
Pro Prefpane style app
AppTrap installs a daemon that runs in the background monitoring the trash, when you drag an app to the trash it will search for associated .plist files that have been left behind and ask to move them to the trash. In other words, AppTrap launches and does the work for you automatically. All you have to do is uninstall apps the old fashioned mac way by dragging apps to the trash.
Cons
Con Discontinued development
Latest release was November 15th, 2014.
Con Not Supported in Big Sur
Con Gets some things, not everything
This is thorough enough in cleaning up most of the cruft that gets left behind by applications, but might not get everything for the more invasive applications, especially if some of the files have privileged permissions.
Con Requires using Finder
Does not work if you trash app using alternate file browser like Path Finder.