F.lux
(Windows, Mac OS X, Linux)
www.justgetflux.com
Does the computer screen ever hurt your eyes? Do you have trouble falling asleep after using the computer? That's because your screen settings are optimized for daylight hours.
f.lux fixes this: it lets you control the color of your computer's display adapt to the time of day. It's better for your eyes and sleep cycle.
uBlock
(Firefox, Chrome, Safari)
www.ublock.org
Too many ads on your favorite websites? Tired of YouTube video ads? With uBlock, ads are a thing of the past!