LibreOffice is good, but i see it more as an alternative to MS Office than to Google Docs. For that i have used
CryptPad, but i don't need it often because i only have one computer and prefer to keep most of my files local. LibreOffice is what i usually use for rich text and spreadsheets.
Android (i think, i'm no expert) is developed by Google but they make available barebones versions that don't have any of the usual bloat or tracking. That's what devices running Android-based operating systems use.
If you don't like that, Ubuntu Touch has already been mentioned. And Apple has their own mobile OS that i'm not familiar with.
Startpage is a search engine that uses Google's web index, so you get pretty similar results without having to directly interact with Google.
Other search engines i use are
Wiby and
Marginalia.
Probably everyone here already knows about Firefox. It's the main alternative to Chromium browsers. I use LibreWolf (a fork of Firefox) as my primary browser, and keep a few others¹ on hand mostly for testing my site. Firefox has plenty of forks that take things in different directions.
LibreWolf,
Pale Moon, and
more i haven't used.
Linux has
GNOME Web, which uses the same rendering engine as Apple's Safari.
There are some smaller browsers not based on Google's Chromium, Mozilla's Gecko, or Apple's WebKit engines.
NetSurf uses its own engine but doesn't have the same support for modern CSS and HTML features that the big browsers do.
Ladybird is not yet available but looks like it's trying to become a viable option like Chrome and Firefox are, with its own new rendering engine. There are also text-based browsers like
Links2,
Lynx, and
w3m.
Some gaming consoles have web browsers too, though i think these tend to be less useful. Last i checked the Wii U's still works. I don't know about most other consoles since everything else i've owned is too old to use the internet.
I've never owned a Chromebook so i don't know much about those, but it should be fairly easy to replace whatever OS they use with some flavor of Linux or your other OS of choice.
Some websites (w3schools, tvtropes) embed Google for searching within the site. I don't know a way to avoid that besides not using the search features or adding "site:w3schools.com" to your usual search engine when you need to find something.
Every Email client i've used does basically the same thing. Gmail, Proton, Tutanota, they're pretty interchangeable. Find one whose ToS you can stomach and fees you can afford. Also, you can write messages on paper and send that to people without using the internet. Ask your local post office for details.
Google Maps was hard to replace. Open Street Map and OsmAnd work as maps, but i've always struggled to get them to show me routes or details about a place. You can still get a real GPS though. I use a HUTNVEA GPS that works except i guess nobody who designed it knows about displays that are visible in sunlight (E-Ink, LCD, TFT, etc.) so it's hard to see when i'm in my car.
Google Drive is similar to Dropbox, MS OneDrive, CryptPad Drive, and every other cloud storage service. If you want your files backed up to someone else's computer any of them will do that for you. An offline hard drive that you maintain manually will also back up your files.
YouTube has some alternative frontends like Invidious, and there are also other ways to host video like Peertube instances.
¹Firefox, Links2, NetSurf, Vivaldi (Chromium), GNOME Web (WebKitGTK) for HTTP, Amphora and Alhena for Gemini.