Thx to  App Defaults.

Here are mine:

• Mail Client: Apple Mail app
• Notes: Obsidian & Apple Notes
• To-Do: Apple Reminders
• Photo Management: Apple Photos
• Calendar: Itsycal
• Cloud File Storage: Apple iCloud, Dropbox
• RSS: Reeder 5
• Contacts: Apple Contacts
• Browser: more in ARC，little in Safari
• Chat: Wechat
• Word Processing: WPS & Notion
• Spreadsheets: Shottr
• Music: Spotify
• Password Management: 1Password
• Code Editor: VSCode