BlogViral

Show HN: C discrete event SIM w stackful coroutines runs 45x faster than SimPy Hi all, I have built Cimba , a multithreaded discrete event simulation library in C. Cimba uses POSIX pthread multithreading for parallel execution of multiple simulation trials, while the coroutines provide concurrency inside each simulated trial universe. The simulated processes are based on asymmetric stackful coroutines with the context switching hand-coded in assembly. The stackful coroutines make it natural to express agentic behavior by conceptually placing oneself "inside" that process and describing what it does. A process can run in an infinite loop or just as a one-shot customer passing through the system, yielding and resuming execution from any level of its call stack, acting both as an active agent and a passive object as needed. This is inspired by my own experience programming in Simula67, many moons ago, where I found the coroutines more important than the deservedly famous object-...

Show HN: ItemGrid – Free inventory management for single-location businesses Hey HN, After building Box QR (personal inventory tracker), I kept hearing "I need this for my business." So I'm exploring ItemGrid - lightweight inventory management that doesn't suck. The problem: Small businesses are stuck between Google Sheets (messy, no mobile scanning) and enterprise software (expensive, overcomplicated). What ItemGrid does: Visual grid interface QR/barcode scanning Multi-location support Free for 1 location forever $8/user when you grow Right now it's just a landing page collecting validation signups. Not building the full product until I hit 50-100 signups to confirm real demand. Would love feedback, especially if you've dealt with inventory headaches. https://itemgrid.io https://itemgrid.io February 3, 2026 at 10:49PM

Show HN: I built an AI movie making and design engine in Rust I've been a photons-on-glass filmmaker for over ten years, and I've been developing ArtCraft for myself, my friends, and my colleagues. All of my film school friends have a lot of ambition, but the production pyramid doesn't allow individual talent to shine easily. 10,000 students go to film school, yet only a handful get to helm projects they want with full autonomy - and almost never at the blockbuster budget levels that would afford the creative vision they want. There's a lot of nepotism, too. AI is the personal computer moment for film. The DAW. One of my friends has done rotoscoping with live actors: https://www.youtube.com/watch?v=Tii9uF0nAx4 The Corridor folks show off a lot of creativity with this tech: https://www.youtube.com/watch?v=_9LX9HSQkWo https://www.youtube.com/watch?v=DSRrSO7QhXY https://www.youtube.com/watch?v=iq5JaG53dho We've been making silly shorts ourselves: https://www.youtube.co...

Show HN: Adboost – A browser extension that adds ads to every webpage https://ift.tt/ZNjCvqU February 2, 2026 at 08:11PM

Show HN: Cloud-cost-CLI – Find cloud $$ waste in AWS, Azure and GCP Hey HN! I built a CLI tool to find cost-saving opportunities in AWS, Azure, and GCP. Why? Existing cost management tools are either expensive SaaS products or slow dashboards buried in cloud consoles. I wanted something fast, CLI-first, and multi-cloud that I could run in CI/CD or my terminal. What it does: - Scans your cloud accounts and finds idle VMs, unattached volumes, oversized databases, unused resources - Returns a ranked list of opportunities with estimated monthly savings - 26 analyzers across AWS, Azure, and GCP - Read-only (never modifies infrastructure) Key features: • HTML reports with interactive charts (new in v0.6.2) • AI-powered explanations (OpenAI or local Ollama) • Export formats: HTML, Excel, CSV, JSON, terminal • Multi-Cloud - AWS, Azure, and GCP support (26 analyzers) Quick example: npm install -g cloud-cost-cli cloud-cost-cli scan --provider aws --output html Real impact: One scan found $11k/ye...

Show HN: Voiden – an offline, Git-native API tool built around Markdown Hi HN, We have open-sourced Voiden. Most API tools are built like platforms. They are heavy because they optimize for accounts, sync, and abstraction - not for simple, local API work. Voiden treats API tooling as files. It’s an offline-first, Git-native API tool built on Markdown, where specs, tests, and docs live together as executable Markdown in your repo. Git is the source of truth. No cloud. No syncing. No accounts. No telemetry.Just Markdown, Git, hotkeys, and your damn specs. Voiden is extensible via plugins (including gRPC and WSS). Repo: https://ift.tt/4hIa1Ei Download Voiden here : https://ift.tt/S9CQ32V We'd love feedback from folks tired of overcomplicated and bloated API tooling ! https://ift.tt/4hIa1Ei February 1, 2026 at 10:09PM