Battery Killer
Cool-looking screensaver, but it runs as a menubar app that’s always flagged in OS X Mavericks as an app using significant energy. When the app is running in the menu bar it forces Macbooks to use the discrete GPU rather than integrated. Quitting this app gave back several hours of battery life on my 2013 MBP.
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Clear Day™: Screensaver (Screen Saver)