Imagemagick.
Every website that supports avatar images and has multiple sizes of the avatars uses imagemagick.
Another one is OpenSSL.
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Imagemagick.
Every website that supports avatar images and has multiple sizes of the avatars uses imagemagick.
Another one is OpenSSL.
Until very recently the whole Resident Evil modding community relied solely on a Maya 3DS script that a Chinese dude named Maliwei777 created in 2012. The community cherished that script but it got harder and harder to get the correct 3DS version to run it.
I think this probably applies...
So Thief: The Dark Project (1999) and Thief 2: The Metal Age (2000), are a couple of classic stealth FPS games, proto-immersive-sims, and still some of my all time favorite games. They both use the Dark Engine, an in-house engine from the now defunt Looking Glass Studios, which also powered System Shock 2.
In 2010, the source code to a System Shock 2 port (for the dreamcast or ps2 iirc...) leaked online, and on 2012 someone used that code to create NewDark and TFix, patches to make these old games work on modern computers (and some bugfixes, support for HD, etc).
There are still updates regularly released for it too!
I must emphasize that these games are still sold on Steam, GOG, etc and this patch is essentially required for them to work. And these are hardly the only games like this, just the ones most personal to me. Retrogaming is built on the backs of unsung individual heroes who backwards-engineer, hack, patch, and mod their favorite games to keep them running for everyone long after the publishers have died or abandoned their work.
There's also Arx Libertatis for Arx Fatalis. Arkane (yes, that Arkane) released the source code for the game. This is a new engine and patch that is basically required. Even if you could play the game on a modern computer (you can't really) you wouldn't want to play without this patch. It does things like making drawing the runes for casting spells more reliable. (For those not aware, you drew runes on your screen and combined them to create spells. You didn't just press a fireball button. You had to figure out what spells combined to make a fireball, and then draw it.)
If you like ImSims or Arkane games, I highly recommend Arx Fatalis. No one has done magic like it since. To be fair, it was one of the slowest and most cumbersome ways to do magic, but it did actually feel like you were part of it. You could cast spells before you learned them if you had the rune and guessed the combination (they all make sense). There were even some spells never told in game that you were expected to figure out. Cheats were even activated using the system, by drawing a certain combination of runes. It's all very cool, and I wish we would get a second modern version of the idea.
Pretty much every basic terminal command for linux. Grep is the one that comes to mind.
Oh and then you get all the projects with recursive acronyms, like WINE Is Not Emulation, MAME Ain't (an) Mp3 Encoder, and of course GNU's Not Unix.
I'd say ffmpeg is a good example, it's used by almost every piece of software that has to manipulate audio or video (including messaging applications), yet not many people know about its existance.
Numpy
Runk means masturbation in Icelandic so that adds another layer of hilarity to this
The world is built on is-even and is-odd!
A few libraries come to mind immediately: fftw (I think the most widely used fft library) or GMP (I think the most used multi precision library).