I decided to write this as a guide to help unplug users from Big Tech/Corporate Internet and provide them with good, well researched alternatives to major tech companies. There will be a mild level of commentary from me as well, and that does openly play into my recommendations.
Operating Systems
The big three (Windows, macOS, GNU/Linux) are heavily corporatized, and
increasingly GNU/Linux is a poor choice due to corporate interests from everyone, including Microsoft. The Linux Foundation is a threat by its very nature.
Outside of this, the options are a lot more relaxed, but come with various drawbacks:
Haiku - Not corporatized, relatively easy to use. Limited software and hardware pool.
OpenBSD, NetBSD - Both aren't corporatized, have a higher learning curve, limited technologically compared to Linux and FreeBSD, and may struggle with non-FOSS friendly hardware.
FreeBSD - Has some degree of corporatized interests and increasingly has diverged from its older goals. However, has the best hardware support of the BSDs.
illumos - Unfortunately behind the pack, but another potential option for some people.
Out of the big three, I'd say, honestly, microsoft windows is probably the best balance of ease of use, and not locking a user down. macOS is anti-power user, and GNU/Linux is magnitudes more difficult for even simple tasks for a great many users.
Search Engines
Seriously, get off Google. They're the worst offender.
Ecosia - Germany-based search provider with anonymized searches and more reliable ranking in my experience compared to DDG or Bing
DuckDuckGo - Uses Bing and Yandex to help rank itself, but has some level of search manipulation (they don't rank sites they consider to be content mills) and has had numerous controversies.
Startpage (formerly lxquick) - An aggregation search engine as far as I can tell.
Out of the big four search engines that are corporatized, Baidu and Yandex are the only options that don't go directly to American big tech, but both Yandex and Baidu go to foreign governments, so use at your own risk.
Browsers
Don't use Chrome, the main build of Firefox, Safari or Opera. There's dozens of better options:
Vivaldi - For Linux, Windows and macOS users this is my top recommendation. It's clean, fast, has nice built-in features, and it carries Opera better than Opera does anymore.
Brave - It's a decent webkit browser, with some neat features. In particular, BAT (basic attention tokens). I also have partnered with Brave on irixnet.org - they won't show ads because I'm not a fan of that noise, but you can tip us BAT and it'll go to the site.
Waterfox - for Mozilla users, use this or GNU Icecat. The main firefox build supports and advertises Mozilla, whose been increasingly political in recent years. They fired Brendan Eich for being a conservative Christian, they support RiseUp, a group associated with antifa and other terrorist organizations, and have been openly pushing a partisan agenda on issues that do not concern the internet itself.
Palemoon/Basilisk - I'm not as big of a fan of these guys, but they do offer a compelling alternative. In particular, their BSD attitudes were shitty beyond belief.
Midori - for Linux users, a decent option.
Email
Zoho - India-based tech company with an office suite and email attached. A million times better than gmail/google docs IMHO.
Protonmail - Swiss-based pro-privacy email service.
Mailbox.org - Another Protonmail-esque service
Mailfence - Heard about this from a friend, only briefly glanced. Looks okay at a glance.
Wiki alternatives
For reference, I do not hate Wikipedia. I do, however, think the english Wikipedia plays into biases more often than it cares to ever admit. I use Wikipedia regularly, but knowing of alternative is perhaps useful:
Scholarpedia - A rather slimmed down, but academically minded Wikipedia hard fork. Basically a more formalized academic Wikipedia.
Citizendium - A rather inactive Wikipedia fork, really a huge shame.
Infogalactic - A Wikipedia fork run by Vox Day claiming to be objective and to not allow editorialization on issues. While I do not agree with Vox Day at all, I have found through talking with contributors from Infogalactic they're more open-minded and friendly to a large degree.
Several reviewers do seem to agree with the mission but not the politics of every aspect.
Out of these, I do contribute off/on to Citizendium and sometimes to infogalactic, the latter mostly on Japanese and Chinese subject articles. I find the fact that they are more open and free with sources and less likely to editorialize and smear people to be a better way. Citizendium would be nice, but it's mostly dead (Check out how most articles are stubs). Infogalactic is more complete, and until I get my articles manhandled like I did on Wikipedia, I'm good.
Social Media Alternatives
This is probably even more controversial than the inclusion of Infogalactic... here goes:
Wt Social - WikiTribune/wtsocial, founded by Jimmy Wales (wikipedia founder)
HackerNews - Yeah, I like this too
Minds - A distributed social network that is run by Bill Ottman
Parler - A censorship-free social network similar to Twitter. I do not use Parler myself, because of privacy concerns, and because I only slightly rank this over the likes of Gab; which I'm not gonna plug here at all because it's shady as hell.
Mastodon - Technically a software rather than a singular thing, but it's a federated social networking service where you can connect to other instances.
Forums to consider
Besides your friendly irixnet, there's a bunch worth looking at:
EAB - English Amiga Board, a favorite of mine from the Amiga community
VCFed - Usual VCF forum suspects
The CoffeeHouse - A relaxed, shoot-the-shit type forum