Infrastructure

Scrutiny for measuring hard drive health
Unmanic for keeping file storage tidy and well organised?
Prometheus and Grafana for dashboards and graphs

Storage

Nextcloud for cloud data storage
PhotoPrism for cloud photo storage
Vaultwarden for password management
Paperless-ngx for scanning and preserving documents (with Gotenberg to help convert to PDF?)
Kopia for backups?

Home automation

Home Assistant and all its features (voice control, etc.)
ESPHome for custom automations (heating management, setting the burglar alarm when the house is empty, etc.)

Misc

Mealie for recipes and meal planning?