Seafile is your personal file storage and synchronization app, which has multi-client support, a mobile app, and still lets you securely share files (and even collaborate on them) with others.
Trilium is an awesome note-taking and knowledge base app on steroids. I’ve been a sponsor of the project for a while, check out its features here: https://www.youtube.com/watch?v=uIvdzzxjdY8&t=51s .
Pi-hole can block ads (for all your LAN devices!) and provide local DNS.
