Pihole
From Wildsong
Runs in a Docker container under Docker Compose on Bellman.
Blocks ads by substituting fake DNS entries for ad servers.
At home, try http:/pi.hole:83
Outside: https://pihole.wildsong.biz/admin (should work inside too!)
Resources
Main page: https://pi-hole.net
Docker install instructions: https://github.com/pi-hole/docker-pi-hole/#running-pi-hole-docker