Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.

Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.

Anchor CMS - Free and lightweight blogging system

SunIZup - SunIZup helps you to know the timings of the various Sunlight phases including the Golden Hour and...

Textpattern - Textpattern is an elegant content management system that is free, open source software.

Solar Clock: Circadian Rhythm - Solar Clock: Circadian Rhythm syncs the Solar time with your Local time and shows important events (Sunrise, Waking up, Breakfast, Lunch, Solar Noon, Sport, Sunset, Sleep Time, …) based on Circadian rhythm.