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Well there's loads - Nextcloud/Syncthing to replace Dropbox, Forgejo to replace Github, Joplin on the back of Nextcloud or similar for note taking.... personal wiki, todo list, email with webmail (Roundcube), home video camera management, etc etc

Check out https://github.com/awesome-selfhosted/awesome-selfhosted

> I am interested in are hosting my own RSS feed reader, an ebook library, and a password manager

You can do that on a Raspberry Pi Zero for $15, and for $12 you can get a 128gb microsd card, plenty of storage. It'll take up minimal power and fit in an Altoid tin.

You can host all of that on an N100 mini-PC in oh... around 4GB RAM, based on the equivalent footprint of the Docker/LXC combos I use for those.