I use Home Assistant as well, but Apple HomeKit (and the new Matter protocol) can also be cloudless I think.

Lots of stuff! Currently running almost all of these in Docker on a Synology NAS:

• Code Server - access my notes files remotely
• Gitea - only used to store notes that are edited in Obsidian (or Code Server as mentioned above)
• Home Assistant - home automation
• Homebridge - used for one or two devices that have better integrations than natively in Home Assistant
• Jellyfin - video streaming platform (installed because it’s FOSS and seems interesting, but I rarely use it)
• Overseerr - user-request app for video streaming platform (installed when I anticipated sharing my movies/shows before realizing that my ISP severely limits my upload speeds)
• Pi-Hole - block all ads network-wide
• Plex - primary video streaming platform
• Radarr - download movies
• Readarr - download books but have had better luck with Libgen on an ad-hoc basis
• Sonarr - download shows
• YTDL - download YT videos
• Wireguard - VPN into the home network