Here is a list of Free and Open Source alternative services to the proprietary counterparts:
Windows, macOS -> Ubuntu, Fedora, Arch Linux…
Android -> Graphene OS
Whatsapp -> Signal
Facebook, Instagram, Twitter… -> Mastodon
YouTube -> PeerTube
GitHub -> GitLab
Discord -> Element
Google -> DuckDuckGo
Google Chrome -> Firefox
Gmail -> Protonmail
Google Drive -> CryptDrive
Google Keep -> Standard Notes
Google Maps -> OpenStreetMap
Google Calendar -> Simple Calendar
Google Domains -> Njalla
Microsoft Office, Google Office… -> Libre Office
Maya, Autodesk, 3DS Max… -> Blender
Unreal Engine, Unity… -> Godot
Photoshop -> Gimp
Adobe Illustrator -> Inkscape