🛠️ All DevTools

[Other] Modern react component library Build stunning web applications with Sera UI's modern React components. Free, open-source, and built with Tailwind CSS & Framer Motion.

[Monitoring/Observability] Monivera.io - Clarity for Your Cloud, Control Over Your Cost After months of building and testing, I’m thrilled to launch Monivera.io – a powerful AI-driven observability platform that simplifies cloud monitoring for everyone, from individual developers to large DevOps teams.

[Other] Debcraft – Easiest way to modify and build Debian packages

[CLI Tool] Ccusage: A CLI tool for analyzing Claude Code usage from local JSONL files

[Other] Show HN: Interactive Bash tutorial that runs in the browser I wrote a tutorial on how to create Bash scripts, where the command line interface runs entirely in the browser using v86 (<a href="https:&#x2F;&#x2F;github.com&#x2F;copy&#x2F;v86">https:&#x2F;&#x2F;github.com&#x2F;copy&#x2F;v86</a>), and the code editor uses Monaco.

[Other] Show HN: Molab, a cloud-hosted Marimo notebook workspace We launched marimo [1], an open-source reactive Python notebook, last year on HackerNews. Today, the most popular recent feature request in Google Colab’s issue tracker asks for marimo support in Colab [2].<p>Rather than try to convince Google to replace their notebook with marimo, we decided to just build our own cloud-hosted notebook service instead. We&#x27;re calling this molab (mo for marimo), and we&#x27;re launching it today.<p>You can try it at <a href="https:&#x2F;&#x2F;molab.marimo.io" rel="nofollow">https:&#x2F;&#x2F;molab.marimo.io</a><p>Some features:<p>- Persistent storage<p>- Link sharing (notebooks are public but undiscoverable, like secret GitHub Gists)<p>- Download notebooks to your machine, reuse them as Python scripts or apps<p>- Upload local notebooks to the cloud from our CLI (coming soon)<p>- Real-time collaboration (coming soon)<p>- Configure computational resources to obtain more CPU or GPU (coming soon)<p>marimo is a modern notebook for modern data workflows; we also built molab on a modern tech stack:<p>- Notebook dependencies are managed by uv, enabling lighting-fast package installation (thanks to uv’s cache and more generally its performant implementation). uv makes it easy to run molab notebooks locally, too: uvx marimo edit &lt;notebook-url&gt; brings the notebook down to your machine.<p>- Persistent storage is powered by R2, Cloudflare’s zero-egress object store.<p>- We use Pydantic logfire to monitor our deployment.<p>- While our implementation is agnostic to the compute backend (stay tuned!), we’re currently running on Modal for fast startups (not to mention a slick developer experience). Modal sandboxes make it easy for us define containers at runtime, containing notebook code and their dependencies. (Shout out to Eric Zhang from Modal for helping us get started.)<p>molab is free to use, as long as usage is reasonable. Our goal is to make is as easy as possible for our community to use marimo notebooks.<p>Finally, learn more at our announcement blog: <a href="https:&#x2F;&#x2F;marimo.io&#x2F;blog&#x2F;announcing-molab" rel="nofollow">https:&#x2F;&#x2F;marimo.io&#x2F;blog&#x2F;announcing-molab</a><p>If this interests you, please give molab a shot and please share feedback — here or on Discord (<a href="https:&#x2F;&#x2F;marimo.io&#x2F;discord" rel="nofollow">https:&#x2F;&#x2F;marimo.io&#x2F;discord</a>).<p>P.S. This is not our commercial product, this is really just for our community.<p>[1] <a href="https:&#x2F;&#x2F;github.com&#x2F;marimo-team&#x2F;marimo">https:&#x2F;&#x2F;github.com&#x2F;marimo-team&#x2F;marimo</a> [2] <a href="https:&#x2F;&#x2F;github.com&#x2F;googlecolab&#x2F;colabtools&#x2F;issues?q=is%3Aissue%20state%3Aopen%20sort%3Areactions-%2B1-desc">https:&#x2F;&#x2F;github.com&#x2F;googlecolab&#x2F;colabtools&#x2F;issues?q=is%3Aissu...</a>

[Testing] Show HN: Mock FedCM Integrations MockFedCM is a free FedCM Relying Party (RP) and Identity Provider (IdP) for testing FedCM integrations. Simulate real-world authentication flows, debug your implementation, and validate user experiences—all without needing a production IdP or RP.

[Other] Show HN: Mark 1.0, a notation that unifies JSON, HTML, JSX, XML, YAML, and more Author of Mark Notation here.<p>Mark is a unified notation for both object and markup data, combining the best of JSON, HTML, and XML with a clean syntax and succinct data model.<p>I&#x27;m glad to announce the 1.0 Release of Mark. This release is just the start of a long journey to make web a better platform to store and exchange data.<p>Your feedback welcome!

[DevOps] Fair-code workflow automation platform with native AI capabilities. Combine visual building with custom code, self-host or cloud, 400+ integrations.

[Monitoring/Observability] Agent for collecting, processing, aggregating, and writing metrics, logs, and other arbitrary data.

[Code Quality] Show HN: Fluent-state: a new fresh take on local React state Hi HN<p>I built *fluent-state*, a lightweight React hook that replaces useState, useReducer, useMemo, and useEffect.<p>It gives you:<p>- A fluent, proxy-based API: `state.user.name(&#x27;Joe&#x27;)` - Immutable updates without spread logic - Automatic dependency tracking - Built-in `compute` for reactive, memoized derived state (no useMemo needed) - Built-in `effect` for reactive side-effects with automatic dependency tracking (no useEffect needed) - Zero boilerplate, full control<p>Designed for local state, nested structures, and clean, declarative code.<p>Demo: <a href="https:&#x2F;&#x2F;stackblitz.com&#x2F;edit&#x2F;vitejs-vite-uh4kyzkf?file=src%2FApp.tsx" rel="nofollow">https:&#x2F;&#x2F;stackblitz.com&#x2F;edit&#x2F;vitejs-vite-uh4kyzkf?file=src%2F...</a> GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;marsbos&#x2F;fluent-state">https:&#x2F;&#x2F;github.com&#x2F;marsbos&#x2F;fluent-state</a> NPM: <a href="https:&#x2F;&#x2F;www.npmjs.com&#x2F;package&#x2F;fluent-state" rel="nofollow">https:&#x2F;&#x2F;www.npmjs.com&#x2F;package&#x2F;fluent-state</a><p>Try it out plz.

[Other] Show HN: UML is dead – so I'm building the tool to revive it Hi HN,<p>UML diagrams were meant to standardise system design, but they’ve become outdated — slow to build, hard to change, and rarely used in practice. Most tools feel clunky, and diagrams often go stale fast.<p>I’m building RapidChart, a tool to bring diagramming back to life — fast, flexible, and developer-first.<p>What makes it different:<p>Cursor-style interface for rapid diagram creation<p>Fully customisable and exportable<p>AI-assisted (works with GPT-4, Claude, etc.)<p>100% free<p>This began as part of my research at Imperial College London, and I’d really value your feedback.<p>Here’s the link: <a href="https:&#x2F;&#x2F;www.rapidcharts.ai" rel="nofollow">https:&#x2F;&#x2F;www.rapidcharts.ai</a><p>Thanks!

[Other] The ultimate UI kit for Go & templ developers templUI Pro builds on templUI — the open source UI kit for Go & templ. 200+ premium UI blocks, ready to copy & paste. No frontend frameworks, no build tools — just Go, Vanilla JS, HTML & Tailwind.

[Other] Online Text Tools to Improve Work Efficiency Free online tools for text processing, case and format conversion. All tools run locally in your browser for privacy. No downloads needed.

[Other] Online coding platform with collaborative problem solving AlgoRux is a coding platform for C, C++, Python, PHP & JavaScript. Practice daily problems, join weekly contests, and collaborate in real time with friends. Perfect for learners, interview prep, and competitive programmers. Try it at algorux.com!

[Other] Trusted, Ready to Use Enterprise IoT Server AtomIoT is an enterprise IoT server to connect, monitor & manage smart devices via LoRaWAN, MQTT, or HTTP. With logs, FOTA, alerts & digital twins. Ideal for companies and customers that make hardware. Get devices online in minutes.

[Other] Logical implication is a comparison operator

[Other] Show HN: Object database for LLMs that persists across chats (MCP server) I’d like to use LLMs for remembering all kinds of things: fitness, to-do lists, contacts, bug reports, research links, whatever. But there is no way to do that now.<p>For example, if I find a great coding tutorial in chat, or tell it how much I ran yesterday, it forgets that when I close the chat. Even if I keep the chat history, I still need to scour through lots of messages to find the data I want. Ideally, Claude would remember all this, and I’d be able to find it later with ease. This is what my team built.<p>It is a collaborative database you add to any LLM that supports MCP. (Claude Code, Desktop, and Pro for now; ChatGPT will soon). You can add, update, and search for items in the database inside chat. You can easily create your own object schemas. There is an automatically generated web UI for using the database. It generates maps, charts, calendars, tables, lists, and other UI elements. You can share or publish the database as well.<p>Over time, we want to make this database powerful enough to make our lives much simpler by letting LLMs replace a bunch of the apps and software services we use daily.

[Other] Run TypeScript code without worrying about configuration

[Other] Show HN: Conductor, a Mac app that lets you run a bunch of Claude Codes at once