Solaris Sky Calendar - An astronomy calendar right in your pocket
Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.
Lumy - Helps you track photographic times
Phonebot - Make phone calls from within a Slack channel
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch
Milligram - A minimalist CSS framework