alt Hacker NewsXV was excellent, and had some features I've never seen anywhere else. For example, it had a control panel that would allow you to take part of the color space and map it uniformly to a different part of the color space, for example, turning all the reds (and just the reds) green.
When my kid, now almost 22, was very small, she would sit on my lap in front of the computer, with XV displaying a picture of Elmo. “Green Elmo!” she would demand. I would adjust the sliders to turn the reds green, and we would laugh uproariously at green Elmo. Next it would be “Purple Elmo!”, and we would laugh even harder.
This kept us both amused for quite a while.
(Update: Here's a picture of what that control panel looked like. The turn-Elmo-green control is top center. https://xv.trilon.com/manual/xv-3.10a/color-editor-1.html)
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The last time that I checked, XV was still in the OpenBSD ports collection. It fits well with fvwm.
I actually bought a license for XV, and I have the manual.
There's something so appealing about those fvwm window borders, aliased font, crisp graphics, and the simple and intuitive UI of xv. There's nothing jumping at you to get your attention, no ambiguous UI elements and dark patterns, just a well designed and functional GUI. We truly lost something along the way, as modern GUIs are rarely this user friendly.
>a control panel
That control panel was really great! Particularly for scanning, it was nice to be able to adjust some of the color curves slightly to correct the scanned image.
However, one thing I REALLY used that control panel for was greyscale images, you could adjust the curve so that things that were barely legible in the image suddenly popped way out. Almost like that trick of rubbing a pencil across a blank page to reveal what someone wrote on the page above it. Or smaller adjustments just to make a greyscale more uniform.
That was really one of xv's superpowers.