What are some alternatives?
When comparing f.lux and ImageOptim, you can also consider the following products
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.
CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
SunsetScreen - Whether you're a morning lark or night owl, SunsetScreen allows you to set the time of the...
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!