pihole, in front of my own DNS, because it's easier to have them to domain filtering.
mythtv/kodi, because I'd rather buy DVDs than stream; rather stream than pirate; but still like to watch the local news.
LAMP stack, because I like watching some local sensor data, including fitness equipment, and it's a convenient place to keep recipes and links to things I buy regularly but rarely (like furnace filters).
Homeassistant, because they already have interfaces to some sensors that I didn't want to sort out, and it's useful to have some lights on timers.
I also host, internally, a fake version of quicken.com, because it lets me update stock quotes in Quicken2012 and has saved me having to upgrade or learn a new platform.