For piano, look at Pianoteq - 50MB of math code that simulates $100k+ pianos, letting you adjust and fine-tune numerous parameters (lid position, microphone placement, etc), no sound-banks used! https://www.modartt.com/
I've wanted to code a VR game for juggling but never found time for it.
Feels like it would be super-easy-to-code and probably would be lucrative. Implement "slow down time" so people can practice juggling in slow motion, add some other features like catch radius and bias towards consistent height of throws and you've got a great game!
My 8-year-old video browser software Video Hub App - shows thumbnails from video as you hover with your mouse. Working on adding minor improvements before I finally get to the (optional) facial recognition "search by face similarity" feature.
I've personally settled on running diff's output into diff-highlight (supplied with Git!) and into ansi2html (one of them; there are many versions of it, and you can write one yourself in about 20 minutes, you only really need very few escape sequences handled, and then wrangle with CSS for additional 2 hours), and calling xdg-open on the temporary file. A neat pipeline, all in all.
I had someone steal my MIT open source software (that I sell for $5) and they are selling it for $11 or more. My software is 8+ years old; they are lying to the customers that they have been developing theirs for years. Very frustrating.
Also you didn't mention you send $3.5 of the $5 to charity! Their Discord has three members, so perhaps it's not very popular? The "creator" lists themselves as "Peoples Grocers" and their website is a weird not-even-half-assed copy of Simon Willison's Weblog: https://peoplesgrocers.com/
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
If the copyright attribution for the original code is missing, that violates the license. MIT is not a "no rights reserved" license like 0BSD or Unlicense.
Except compatibility, but the biggest gap is browser support, which is in the process of getting closed. Chrome has shipped JXL support behind a flag. Firefox are in the process of implementing support.
In Chrome you can enable JXL from here:
chrome://flags/#enable-jxl-image-format
Here's a blog post by him: https://cloudinary.com/blog/2026-the-year-of-jpeg-xl
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