Reading this as “FOSS” then:
- Espanso - cross platform text expander
- Nextcloud - complete iCloud replacement
- Thunderbird (email)
- Firefox (safari replacement)
- VS Codium (VS Code without the Microsoft “phone home” activity)
- Homebrew - package manager for MacOS
- Tailscale - overlay network (partly open source) and
- Wireguard - VPN
- cryptomator - the best encryption tool by far
- pihole - network wide ad blocking and DNS
- audiobookshelf - audiobook and podacst manager / player
- whoogle - self hosted google replacement
- mealie - recipe manager
- vaultwarden - self hosted bitwarden server
- shiori - pocket replacement
- Vikunja - OmniFocus replacement
- gitea - Github replacement
- Calibre and Calibre-web - ebook manager
- Home Assistant - Apple Homekit / Home app replacement
- Joplin - best markdown notes app
- OnlyOffice - the best O365 / Apple iWorks replacement
- KASM - container streaming platform (running on my iMac in a docker container)
I’ve moved all of my workflow over to these apps over the past year or so, and am extremely happy with the result.