Pelican

Pelican is a non-intrusive, integrated application that includes messaging, a shared calendar for managing appointments and events with invitations, tasks and reminders, posts and channels, as well as the creation of photo albums associated with events. The calendar can be shared selectively, on a case-by-case basis, and can synchronize with your mobile and PC calendars. Pelican allows you to create public or private channels and publish your stories or posts in a targeted way; you decide who they are sent to, not an algorithm. For your privacy, Pelican allows you to have multiple profiles within your account, adapted to each specific context. Pelican does not collect any user data and does not store this data on its servers.
It is a very comprehensive tool for everyday use, for yourself, for communicating with family, and with your community.