Ask HN: What Are You Working On? (December 2025)

I'm writing a toy eigenvalue solver in Rust using the QR algorithm. I didn't intend to, but I recently discovered the Gershgorin Circle Theorem and thought it'd be neat to create an interactive visualisation for my [blog](https://abstractnonsense.xyz).

I don't like JavaScript, and I've been meaning to learn Rust for a while, so I'm compiling the Rust algorithm to WebAssembly to run in the browser natively! It's been a fun trip back into the arcane world of numerical algorithms and linear algebra!

https://Jar.Tools - online java jar files decompiler and content viewer

I'm working on a collection of stackable interactive slides for teaching numerical methods and operational research.

https://okaleniuk.codeberg.page/blackboard/

The idea here is, one can pick the slides they want and arrange them into a sequence right in the URL. This way, there is no registration, no user data collection, no persistent state even. You just pick the slides, teach your material, and move on.

It's very raw, I still want to add a convenient sequence constructor, a "blank" slide so you could display your own content in it, and a similar quiz page. But I already used some of the slides for teaching, students seem to like them.

Hopefully, I'll have the rest done by the beginning of the spring semester.

Great idea, I'm keeping my fingers crossed for this initiative.

I believe that the main challenge would be to get more traction and build a community. Hope you find a way to encourage as many people as possible to join the website.

My very minor nitpick -- I would add some kind of background colour to the main post list, something like #FAFAFA looks fine to me.

I'm building a Typeform/Google Forms alternative that integrates into existing applications and stores data in your own database. It allows you to define forms in JSON Schema or JSON Forms. Forms can be added or removed dynamically, and submissions are sent to your backend and in turn stored in your database.

Built using our full-stack library toolkit Fragno [0].

[0]: https://fragno.dev/