TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Solaris Sky Calendar - An astronomy calendar right in your pocket
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Lumy - Helps you track photographic times
Membee - Membee is web-based membership management software.
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch