Solaris Sky Calendar - An astronomy calendar right in your pocket

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

Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch

Anchor CMS - Free and lightweight blogging system

Alpenglow - Never miss a incredible looking sunrise or sunset again

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