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Proxmox, opnsense, fdroid, and many more on r/selfhosted (now on lemmy also) .
sunshine, moonlight ( play my games anywhere in the world, games run on my pc at home)
Firefox (the best browser against google monopoly), thunderbird (best mail client)
LineageOS, microG, Mozilla Location services, Magisk, aurora store (let me use Android without any of google tracking)
Bitwarden, Proton mail/vpn, Nextcloud (finally no gmail tracking)
Jellyfin, kodi (lets me create my own Netflix)
GNU/Linux, GNOME, KDE and host of other Linux projects. No more windows tracking. Also if you want to really know how the OS works, you should start tinkering with Linux. I expanded my knowledge base by just using Linux as daily driver.
The list just goes on and on. I am so grateful for all the open source devs that put their time in developing these tools.
For those wanting to go further, checkout https://github.com/awesome-selfhosted/awesome-selfhosted
Firefox lets you use extensions on mobile too