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Our suggestions

GPL-distributed Python software that draws sunrise, sunset and daylight graphs.

Sunrise/sunset hours, all year long

GPL-distributed Python software that draws sunrise, sunset and daylight graphs.

 
GPL-distributed PHP software which transforms mailing list archives to W3C-compliant web pages.

Your mailing lists available through the web

GPL-distributed PHP software which transforms mailing list archives to W3C-compliant web pages.

 
History, advantages and usage contexts of the PNG image format.

A flexible, optimized and free image format

History, advantages and usage contexts of the PNG image format.