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"
Free and Open Source Software
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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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
Teeworlds. When I was a kid I searched up "free online multiplayer games on pc" and it actually led me to this Wikipedia article full of open source games. I tried out teeworlds and I was hooked on it and it led me to playing other open source games like cube 2 and open arena. In my head, the term open source meant "free stuff". Searching for open source stuff led me to discovering Linux and trying it though the Wubi installer and eventually moving to it a few years later.
For me, the gateway was via palm pilot careware. My dad had a PDA when I was a kid, and he let me learn how to program it. Then I learned that there were websites to download software for it, and some of that software was "careware", ie pay only if you're able. Something clicked in my head that I could both write and access software without cost being a barrier, and that got me reading about FLOSS philosophy as I entered high school and suddenly I was dual booting ubuntu on the intel iBook I had saved up for and then it was too late for me: FLOSS had me.
My buddy’s mom took his pc as punishment for some nonsense. We cobbled together some parts so he could secretly play an online flash game with me. His frames were seconds behind mine. But we installed Ubuntu on it since we couldn’t afford windows in high school. So I learned about Linux.