The other day I was able to delete 80gigs of dupicated files cause by copying and pasting on a GUI
Free and Open Source Software
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Instant Messenger was the shit back in the day.
KDE 3 over everything else.
I love modern KDE, and use many different desktop environments regularly, but nothing will ever come close to the feeling I had the first time I got to experience KDE. And I really don't think anyone has been able to approach the configurability KDE 3 had
I literally can not think of anything software wise, especially FOSS as I use the command line a lot and those tools and concepts go back decades. Being a retro computer geek I can list a ton of old proprietary systems or software that I consider perfectly usable.
Oh wait, I just thought of one: RiscOS Open. The best OS for ARM besides Linux, all my Pi's run on it and it natively uses BBC BASIC, although not Free as in Freedom BBC BASIC, or even BASIC in general is a programming language that has a lot to offer.
Although not software I think the biggest thing I have in mind would be Optical Media. Most consider it obsolete, even against data tape, but I use it extensively precisely because it has features no other media possesses (ignoring LTO tape). Featurea such as many decades of longevity, cheapness (even today it's cheaper than equivalent sized flash media) and above all it's the only media that has read only properties.
SSD's, HDD's are not close to archival grade, only optical and tape (ignoring film and the ultimate archival media, vellum) are.
All my data that must be recovered at all costs is archived to BD-R, which in turn is backed up to LTO tape, which in turn is backed up into the cloud. Both the bd-r and LTO tape are written and finished days before the data has been uploaded to the cloud! Because my upload speed is 20Mb/s maximum the old SCSI LTO 4 drive writing to tape at 60MB/s wipes the floor with it, the bd-r records much slower than that but still is done in a fraction of the time.
Maybe if I'm ever able to get 1Gb upload bandwidth I'll use the cloud more, but at the moment it's running at a slower speed than my first 486 with it's 210MB HDD!
Edit: Ah! Wait, I forgot to mention Window Maker. I use Window Maker as my window manager. Works like a charm and hasn't changed in looks one bit since the 90's
I still use Usenet BBS boards.
Amarok 1.4. Loved that thing. Everything that came afterwards in both terms of version and other similar apps even the mainstream ones do not get close to how good Amarok used to be.
I still get most of my news via RSS. Lemmy is my sole social media usage. I use Matrix every day but see it as very different to IRC for some uses. Forums are useful but much of the tech content you find via search engines is out of date. Also not all forums are created equally. The new KDE forums have a major shortcoming compared to the old version.
Sftp. At work we are switching to api and it sucks in comparison. Even it works its great but when it doesn't its harder to fix than sftp.
One more: Network shares vs. clowd storage fx M365 and Google drive. Often the ekstra functionality isn't needed and just adds complexity. Plus the bandwidth is rarely the same. But It IS wHAt EvERyOne IS dOIng