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.

OctoPrint is the snappy web interface for your 3D printer that allows you to control and monitor all aspects of your printer and print jobs, right from your browser.

Navidrome is a self-hosted, open source music server and streamer. It gives you freedom to listen to your music collection from any browser or mobile device.

"Firefly III" is a (self-hosted) manager for your personal finances. It can help you keep track of your expenses and income, so you can spend less and save more. Firefly III supports the use of budgets, categories and tags. It can import data from external sources and it has many neat financial reports available. (Taken from the README)

Tiny Tiny RSS is a free and open source web-based news feed (RSS/Atom) reader and aggregator