It surely don't count but reddit
Free and Open Source Software
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I had been using some form of UNIX and some early GNU utilities for a few years by time Linux came out and had heard some rumblings about 386BSD (development started in 1989) via newsgroups, but it remained out of reach for me.
I heard about Linux (SLS Linux) being available late summer of 1992 and started saving for a 386, which I build later that year.
In the end, due to download limitations I started with HJ Lu's boot/root disks for Linux (floppy disk images), starting with kernel version 0.12 and happily living in the terminal.
Virtual terminals were the killer app that kept me solely on Linux for a long while. Being able to download on one terminal and code in a 2nd (I programmed a MUD for free dial-up Internet access for a local system) was amazing and far better than Windows 3.x during this time frame.
For me it was Python and C development on Linux. (So Anaconda.) I was pretty impressed by how much you can do with free software. Before I would have thought scientists would use expensive proprietary software for calculations. Later I learned that they sometimes still do, but many write their own code using work from others in the field who released open source software.
Crostini (The Chromebook Linux solution)
The very first FOSS software I used was red hat Linux. My dad brought home a copy of it and left it laying next to our copy of windows. Next time I had to install an OS I found it and tried it. It was terrible. Didn't do anything I wanted to do. Put windows in the computer.
Emacs.
No really, it was like 1989 and I had to learn Unix systems for classes, and this white haired Emacs advocate convinced me to try it.
I just really wish I could answer 'Obsidian' 😓
I think it was Okular. I was looking for a way of editing PDFs without ads, invasive software, or subscription based payments.
WWIV
I don't remember exactly anymore, but I guess... Firefox? And then Ubuntu after I got "serious" about it.
It started with Fedora for me, then Firefox but OpenOffice was the first that made me think "hey, that's good for everyone, not just geeks like me, I gotta show it to my friends and clients"
Oh god, it must be from the 80s-90s, I'd say BSD, it was incredible to have sources at the time. I remember it was BSD4.3
Wow. I honestly can’t tell. I think it was ChromOS? Indirectly of course.
Years and years ago, I was really frustrated with windows on my tiny laptop, and I wanted something different. And I loved ChromeOS back then, but I couldn’t afford a Chromebook, and I was looking for something that had a similar interface.
So I looked online, and people were recommending Linux, but I already knew of Linux, as I had a terrible experience with Ubuntu a while before (it was using Unity, to give you a timeframe). But eventually, I found something, it was a post on Reddit by someone looking for something like me, something that would look like what chromous looked like at the time, that was as simple, and one of the best suggestion there was a distribution by the name of “SolusOS”, Specifically, the Budgie variant.
So, I installed it on my little laptop. I fell in love with it, the whole thing, the desktop, the project, Linux as a whole, And then they just kind of snowballed from there. Solus was my go to distro for years.
Now I’m stuck on a MacBook Air, on Mac OS, for many reasons, and I want something new. But even before that, when I had to give up on that laptop and Solus for various reasons, I used many others distros. And I really loved some. But I still miss my tiny laptop and Solus on it…
I miss this simple joy of just using my machine and it just working. I feel like, every piece of tech that is in my life, right now, to try and simplify it, to help me do things, is only making my life worse, and bothering me with stupid stuff at every turn…
Or maybe it’s because I just grew up, I became an adult, lots of things happened in my life, and I just miss how simpler things used to feel back then, maybe I just reflect that in my technology. I don’t know. But I miss it… a lot.
Xournal++
Red Hat 6 on the front of a magazine in 2000 which was an interesting curiosity, and then a Fedora Core 2 live disc my university lecturer was handing out in 2004.
DDWRT technically came first for me, and m0n0wall, but OpenSolaris is where I really started to use it.
OpenTTD. Sure, I had used android, but it was the first thing I consciously knew was open source and enjoyed.
OpenFOAM. I needed powerful software to do CFD that was free, as in free beer, and found OpenFOAM. To run it on windows, the installation instructions first step was install linux on a vm then follow the linux installation instructions. I did that and started using the vm for other stuff until I found myself using the vm for most tasks, but kept using windows for gaming. To learn more, I got myself a pinebook, which replaced most of the usage of my vm. When windows decided to self destruct, I had learnt enough to install and configure arch with minimal help. Now, nothing can persuade me to go back.
Suse Linux 4.4
Linux and godot
Linux
Fedora Linux, tbh
Suse in 1999.
First used Linux mint in 2007, was fascinated and frustrated at the same time with why things didnt work like on my windows PC, I now have a dedicated Linux Laptop (linux mint)
Vim and GCC.
I had used plenty of open source products in the past, but the first one I truly learned the "why it's important" is home assistant. Seeing the strong community and reading more about open source projects and why it's to everyone's benefit.
We can make a far superior, safer, and community first product.
For me it was probably Gimp and then Linux (specifically mandrake). I'm shocked I havnt seen mention of VLC yet though, as it's another one that gets use every day for me.