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For Linux users I can highly recommend Redshift[1]. The color temperature settings seem to differ some from f.lux but everything else works great!

[1] http://jonls.dk/redshift/

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Not just for Linux users: If you are using f.lux on windows but wish that you could control the temperate on demand (rather than it being automatic according to the current time) switch to Redshift and don't look back.

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