I cover some of this on /uses, which is the traditional place for this kind of stuff, but this is going around the internet right now and the lists I’ve seen (here, here, here, and here) are a little more thorough and focused on a different set of software, specifically.
Mail clients/servers: Gmail web with some custom styles applied via Stylus, Proton Mail (also web). I’ve been trying to transition to the latter for a long time now.
Notes: Logseq
Todos: Notion and Your Daily Page
Calendar: Google
Cloud storage: Google Drive, Proton Drive
RSS and Read Later: Readwise Reader
Contacts: Google
Browser: Desktop: Brave or Firefox. I was all-in with Firefox and happy except for Notion, which did not perform well in Firefox, so I’ve switched for the moment to Brave. Phone: Firefox.
Chat: SMS: Google Messages. Other: Discord, Signal, some Slack, some GroupMe.
Bookmarks: Notion
Presentations: Haven’t had to in a while
Documents: Notion, VS Code, or Google Docs
Spreadsheets: Google Sheets
Shopping Lists: Simplenote
Personal Finance: N/A but I have a Notion todo with a lot of links 😬
News: Mastodon, or on rare occasions Google News
Photo Management: Google Photos
Photo Editing: Krita, Google Photos
Music: Spotify
Podcasts: Pocket Casts
Passwords: 1Password
Code Editing: VS Code
Terminal: GNOME terminal
Still a lot of Google in there. 😕
Turns out, I did a list like this in 2017, it is interesting in that the list has changed significantly.