I’d like to share with you my first GNOME Shell extension, Timezone: It helps people like me, who work in a distributed (global) team and need to know where and when their coworkers are.
It reads a JSON file containing all people data and renders them into a nice overview organized by timezone. See all relevant information on its page: https://github.com/jwendell/gnome-shell-extension-timezone.
Please, install, test it and report any issue you find. Hope it’s useful to anyone as it is for me 🙂