Unraid is software for storing and managing digital files on a mass-storage server. It is an embedded Network Attached Storage (NAS) server operating system.
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.
youtube-dl is a command-line program to download videos from YouTube.com and a few more sites