Quick and dirty! Here’s all the stuff I can think of…
Mail Client: Apple Mail and Thunderbird
Mail Server: Fastmail
Notes: Apple Notes
To-Do: Nothing
iPhone Photo Shooting: iOS Camera
iPhone Photo Backup: Nextcloud
Photo Management: Apple Phones (on iPhone), On1 on MacOS
Calendar: Apple Calendar
Cloud File Storage: Nextcloud
RSS: TinyTinyRSS
Contacts: Apple Contacts
Browser: Firefox
Chat: iMessage
Bookmarks: Firefox
Homepage/News: Protopage
Music: Apple Music (The app, not the service)
Podcasts: Overcast
Password Management: KeePassXC
Other Default Apps and Devices:
Mastodon Client: Mono
eReader: Kindle Oasis
Digital Audio Workstation (DAW): AVID Pro Tools
Video Editing (NLE): Davinci Resolve
Linux Distribution: Debian (Bookworm)
Firewall: OpnSense (PC Engines APU4)
VPN Platform: Wireguard
Storage System: ZFS (on Debian)
Virtual Machines: KVM/qemu
Containers: Podman
Backup Service: Crashplan Pro
ZFS Data Replication: Syncoid (Sanoid)
Non-Web File Syncing: Syncthing
Home Automation: Home Assistant (Zigbee and WiFi for devices, with MQTT)
Weather Station: WeeWx
‘Serious’ Camera: OM Digital Solutions OM-1 (Micro Four Thirds)