[typpo]

Open source/linux version: http://jonls.dk/redshift/

(apt-get install redshift)

[JetSpiegel]

Works flawlessly, and the configuration file is a single file, which makes it easy to keep synced between computers.

[vezzy-fnord]

If you care about your freedom, use this, definitely.

[satyampujari]

This is cool.Thanks for sharing.