Show HN: Punch card simulator and Fortran IV interpreter https://ift.tt/UtQXaYj

Show HN: Punch card simulator and Fortran IV interpreter Code: https://ift.tt/luIDgjK Just for fun, I've only spent a few hours on it so far. What are everyone's punch card emulation needs? https://ift.tt/3YRSDol March 3, 2026 at 12:00AM

Show HN: Mrkd – A native macOS Markdown viewer with iTerm2/VSCode theme import https://ift.tt/dQMvcbi

Show HN: Mrkd – A native macOS Markdown viewer with iTerm2/VSCode theme import Using Opus 4.6 I built a markdown viewer for macOS that uses zero web technology. No Electron, no WebView — markdown is parsed with cmark-gfm and rendered directly to NSAttributedString via TextKit 2. The result is native text selection, native accessibility, and a ~1MB binary that launches pretty much instantly. It supports GFM tables, task lists, syntax-highlighted code blocks, and inline images. You get a built-in themes (Solarized, Dracula, GitHub, Monokai) plus the ability to import your own from iTerm2 or VS Code theme files. The part I’m most pleased with is the Quick Look integration — select a .md file in Finder, hit Space, and you get a fully themed preview using whatever theme and fonts you’ve configured in the app. No setup required; the QL extension registers automatically on first launch. It also bundles variable fonts (Geist, Inter, JetBrains Mono, iA Writer Mono, and more) so typography looks good out of the box. The whole thing is built in Swift with no dependencies beyond cmark-gfm and Highlightr. https://ift.tt/Pns3HSZ https://ift.tt/Pns3HSZ March 2, 2026 at 01:48AM

Show HN: PraxisJS – signal-driven front end framework and AI experiment https://ift.tt/6rN5FJE

Show HN: PraxisJS – signal-driven front end framework and AI experiment I built PraxisJS, a signal-driven frontend framework exploring what a more explicit and traceable architecture could look like. PraxisJS started as a personal project. It reflects a single perspective on frontend design, not a committee decision, not a consensus. I wanted to see how far you can push explicitness before it becomes friction. Most frameworks optimize for writing less. PraxisJS questions that tradeoff. @State doesn’t suggest reactivity, it is reactive, visible in the code. Signals reach the DOM without a reconciliation layer in between (the renderer is still evolving toward that goal). It also became an AI-assisted experiment, not to automate thinking, but to pressure-test ideas. Some parts came from that collaboration. Some exist because it failed. v0.1.0 beta, experimental, not production-ready. But the ideas are real. https://praxisjs.org/ March 2, 2026 at 12:57AM

Show HN: Panel Panic a Rust/Macroquad/WASM Panel de Pon/Tetris Attack Clone https://ift.tt/5djvNWU

Show HN: Panel Panic a Rust/Macroquad/WASM Panel de Pon/Tetris Attack Clone Rust/macroquad game with single player AI mode, online VS, and local 1v1. All running via WASM in the browser. Still WIP as art assets still need to be added and tweaked. Full disclosure. Used Claude Opus, Nanobanana, and SunoAI a huge amount to do the heavy lifting for this project https://panel-panic.com March 1, 2026 at 10:48PM

Show HN: Monohub – a new GitHub alternative / code hosting service https://ift.tt/joxLuPd

Show HN: Monohub – a new GitHub alternative / code hosting service Hello everyone, My name is Teymur Bayramov, and I am developing a forge/code hosting service called Monohub. It is at a fairly early stage of development, so it's quite rough around the edges. It is developed and hosted in EU. I have started developing it as a slim wrapper around Git to serve my own code, but it grew to such extent that I decided to give it a try and offer it as a service. It doesn't have much at the moment, but it already has basic pull requests. Accessibility is high priority. It will be a paid service, but since it's an early start, an "early adopter discount" is applied – 6 months for free. No card details required. I would be happy if you give it a try and let me know what do you think, and perhaps share what you lack in existing solutions that you would like to see implemented here. Warmest wishes, Teymur. https://monohub.dev/ March 1, 2026 at 12:43AM

Show HN: Tomoshibi – A writing app where your words fade by firelight https://ift.tt/K2f5zan

Show HN: Tomoshibi – A writing app where your words fade by firelight I spent ten years trying to write a novel. Every time I sat down, I'd write a sentence, decide it wasn't good enough, and rewrite it. The problem wasn't discipline — it was that I could always see what I'd written and go back to change it. I tried other approaches. Apps that delete your words when you stop typing — they fight fear with fear. That just made me panic. I wanted the opposite: not punishment, but permission. "Tomoshibi" is Japanese for a small light in the dark — just enough to see what's in front of you. You write on a dark screen. Older lines fade, but not when you hit return. They fade when you start writing again. If you pause, they wait. You can edit the current line and one line back — enough to fix a typo, not enough to spiral. The one-line-back rule also catches my own practical issue: Japanese IME often fires an accidental newline on kanji confirmation. Everything is saved. There's a separate reader view for going back through what you've written. Tomoshibi is for writing over months, not just one session. When you come back, your last sentence appears as an epigraph — as if it always belonged there. No account, no server, no build step. Your writing stays in your browser's local storage — export anytime as .txt. Vanilla HTML/CSS/ES modules. Try it in your browser. A native Mac app (built with Tauri) with file system integration is coming to the store. I've been writing on it for two months. https://ift.tt/pbWkY0z https://ift.tt/m4MLbno February 28, 2026 at 10:42PM

Show HN: BananaOS, vibecoded operating system that boots on a 486 with ~11MB RAM https://ift.tt/bp7LqOY

Show HN: BananaOS, vibecoded operating system that boots on a 486 with ~11MB RAM My 10-year-old son has been deep in low-level rabbit holes lately and ended up vibe-coding his own operating system. Since he’s still a kid and not on HN himself, I’m posting this on his behalf with his permission. This started as curiosity about how computers actually boot, and somehow escalated into writing a kernel, building a GUI, and setting up CI that produces a bootable OS image on every commit. BananaOS is a small experimental operating system built mainly for learning and exploration of low-level systems programming. It currently targets i386 BIOS systems and is designed to run on extremely constrained hardware. Fun fact: Wallpaper logic, one of the most important OS functionalities, is directly implemented in the kernel. That cracked my son up! Some highlights: Multiboot-compliant kernel loaded via GRUB VESA framebuffer graphics with double buffering Custom window manager with movable and resizable windows Dock-style application launcher PS/2 keyboard and mouse input handling PCI enumeration and AHCI SATA support Basic applications (terminal, notepad, calculator, file explorer, settings) Memory detection and allocation based on available RAM Boots in QEMU with about 11.2 MB RAM Includes an ISR workaround to emulate CMOV so it can boot on Intel 486 CPUs One thing I found particularly fun: he also added GitHub Actions workflows that automatically build the OS image for every commit, so the repo continuously produces fresh bootable artifacts. The project is very much experimental and should only be run inside an Virtual Machine. Repo (with build instructions and screenshots): https://ift.tt/XTNhz3r Quick start (only on Linux, check dependencies, and see README): git clone https://ift.tt/XTNhz3r cd BananaOS make qemu-system-i386 -cdrom bananaos.img -m 128M Retro mode: qemu-system-i386 -cpu 486 -cdrom bananaos.img -m 11.2M He’s mainly building this to understand kernels, memory management, drivers, and how operating systems actually work below user space. Feedback from people who have built hobby operating systems or worked close to hardware would be especially appreciated. February 27, 2026 at 11:13PM