Nextcloud is an open source, self-hosted file share and communication platform. Access and sync your files, contacts, calendars and communicate and collaborate across your devices.
Paperless-ngx is a document management system that transforms your physical documents into a searchable online archive so you can keep, well, less paper.
This project comes as a pre-built docker image that enables you to easily forward to your websites running at home or otherwise, including free SSL, without having to know too much about Nginx or Letsencrypt.
OPNsense is open source, FreeBSD-based firewall and routing software developed by Deciso. It is a fork of pfSense, which in turn was forked from m0n0wall.
SOGo is a fully supported and trusted groupware server with a focus on scalability and open standards.
Part of the Mailcow stack.