Jellyfin is the Free Software Media System that puts you in control of managing and streaming your media. There are no strings attached, no premium licenses or features, and no hidden agendas.
Paperless-ngx is a document management system that transforms your physical documents into a searchable online archive so you can keep, well, less paper.
JDownloader is a free, open-source download management tool with a huge community of developers that makes downloading as easy and fast as it should be.