I’ve been using HA for a long time now. I maintained the Archlinux AUR package for home-assistant for a time.

Now I spend some time to develop custom integrations:

• for my Panasonic heatpump
• to track the Ecowatt level in France
• to track water restrictions in France

and a bunch of integrations that I’m probably the only one to use:

• ecogaz
• prometheus import to import metrics from prometheus into HA (usually people do the reverse)
• radio france programs to know what’s airing on a given Radio France station
• an achievement system for HA
• an integration for geovelo