🛠️ All DevTools

[Other] Show HN: I made a JSFiddle-style playground to test and share prompts fast I built this out of frustration as I lead the development of AI features at Yola.com.<p>Prompt testing should be simple and straightforward. All I wanted was a simple way to test prompts with variables and jinja2 templates across different models, ideally somthing I could open during a call, run few tests, and share results with my team. But every tool I tried hit me with a clunky UI, required login and API keys, or forced a lengthy setup process.<p>And that&#x27;s not all.<p>Then came the pricing. The last quote I got for one of the tools on the market was $6,000&#x2F;year for a team of 16 people in a use-it-or-loose-it way. For a tool we use maybe 2–3 times per sprint. That’s just ridiculous!<p>IMO, it should be something more like JSFiddle. A simple prompt playground that does not require you to signup, does not require API keys, and let&#x27;s experiment instantly, i.e. you just enter a browser URL and start working. Like JSFiddle has. And mainly, something that costs me nothing if I&#x27;m or my team is not using it.<p>Eventually I gave up looking for solution and decided to build it by myself.<p>Here it is: <a href="https:&#x2F;&#x2F;langfa.st" rel="nofollow">https:&#x2F;&#x2F;langfa.st</a><p>Help me find what&#x27;s wrong or missing or does not work from you perspctive.<p>P.S. I did not put any limits or restrictions yet, so test it wisely. Don&#x27;t make me broke, please.

[Other] Show HN: BinaryRPC – Lightweight WebSocket-based RPC framework in modern C++ Hi HN,<p>I’m a recent CS graduate. During the past few months I wrote BinaryRPC, an open-source RPC framework in modern C++20 focused on low-latency, binary WebSocket messaging.<p>Why I built it * Wanted first-class session support, pluggable QoS levels and a simple middleware chain (global, specific, multi handler) without extra JSON&#x2F;XML parsing. * Easy developer experience<p>A quick feature list * Binary WebSocket frames – minimal overhead * Built-in session layer (login &#x2F; reconnect &#x2F; heartbeat) * QoS1 &#x2F; QoS2 with automatic ACK &amp; retry * Plugin system – rooms, msgpack, etc. can be added in one line * Thread-safe core: RAII + folly<p>Still early (solo project), so any feedback on design, concurrency model or missing must-have features would help a lot.<p>Thanks for reading!<p>also see &quot;Chat Server in 5 Minutes with BinaryRPC&quot;: <a href="https:&#x2F;&#x2F;medium.com&#x2F;@efecanerdem0907&#x2F;building-a-chat-server-in-5-minutes-with-binaryrpc-qos2-session-management-and-room-plugin-ccb66d722466" rel="nofollow">https:&#x2F;&#x2F;medium.com&#x2F;@efecanerdem0907&#x2F;building-a-chat-server-i...</a>

[Code Quality] The uncompromising Python code formatter

[Other] This repository contains a 90-day cybersecurity study plan, along with resources and materials for learning various cybersecurity concepts and technologies. The plan is organized into daily tasks, covering topics such as Network+, Security+, Linux, Python, Traffic Analysis, Git, ELK, AWS, Azure, and Hacking. The repository also includes a `LEARN.md

[Other] uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.

[Other] Build Real-Time Knowledge Graphs for AI Agents

[Other] Build , Deploy, Manage and Debug n8n workflows with AI This is currently in Beta

[Other] Developer tools suite ForgeKit - Your all-in-one developer toolkit for rapid coding and debugging

[IDE/Editor] Stunning, elegant code snippets image directly from VS Code Blazing-fast VS Code extension to capture beautiful, syntax-highlighted code screenshots in few clicks. No setup. No cropping. Just clean, social-ready code shots – perfect for devs, bloggers & creators. Built for speed, designed for simplicity.

[Other] Detect and protect against satellite cyber threats Orbisect is a cybersecurity and monitoring toolkit purpose-built for satellites, CubeSats, and ground stations. It decodes command streams, detects malicious activity in real time, and secures critical data using post-quantum encryption.

[Code Quality] Free online json formatter, validator & converter JSONPilot is your co-pilot for formatting, validating, minifying, beautifying, and converting JSON. Built for developers, fast and secure.

[API/SDK] Intelligent api mocking & testing platform Transform API development with intelligent, stateful mock APIs. Get a sandbox environment for any API in seconds and ship features 40% faster with the ultimate API simulation platform trusted by development teams worldwide.

[Other] 0xWebOS openOS 0xWebOS is a next‑generation, hacker‑inspired web operating system that transforms website creation into an immersive terminal‑like experience. Some functions of this web operating system are not yet available

[Other] Win Freelance Projects 10x Faster with AI Bidding Automation Bidvoty is an AI-powered bidding assistant for Freelancer.com that helps you grab more clients in less time — automatically. Whether you're a freelancer tired of repetitive proposals or just starting and unsure what to write — Bidvoty handles it for you.

[Other] Track Your Keyword Rankings For FREE KeywordRankChecker (KRC) is the simplest way to track your keyword rankings with precision. Fast, reliable, and cost-effective. You only pay for the API usage, nothing more.

[Other] A curated list of awesome developer tools and services A curated list of awesome developer tools and services — from cloud platforms and IDEs to AI-powered coding assistants and productivity utilities.

[Other] A micro (7kb) Material Design 3 based CSS-only framework A micro (7kb) Material Design 3 (Expressive) based CSS-only framework

[DevOps] Incus – Next-generation system container, application container, and VM manager

[Other] Show HN: RULER – Easily apply RL to any agent Hey HN, Kyle here, one of the co-founders of OpenPipe.<p>Reinforcement learning is one of the best techniques for making agents more reliable, and has been widely adopted by frontier labs. However, adoption in the outside community has been slow because it&#x27;s so hard to implement.<p>One of the biggest challenges when adapting RL to a new task is the need for a task-specific &quot;reward function&quot; (way of measuring success). This is often difficult to define, and requires either high-quality labeled data and&#x2F;or significant domain expertise to generate.<p>RULER is a drop-in reward function that works across different tasks without any of that complexity.<p>It works by showing N trajectories to an LLM judge and asking it to rank them relative to each other. This sidesteps the calibration issues that plague most LLM-as-judge approaches. Combined with GRPO (which only cares about relative scores within groups), it just works (surprisingly well!).<p>We have a full writeup on the blog, including results on 4 production tasks. On all 4 tasks, small Qwen 2.5 models trained with RULER+GRPO beat the best prompted frontier model, despite being significantly smaller and cheaper to run. Surprisingly, they even beat models trained with hand-crafted reward functions on 3&#x2F;4 tasks! <a href="https:&#x2F;&#x2F;openpipe.ai&#x2F;blog&#x2F;ruler">https:&#x2F;&#x2F;openpipe.ai&#x2F;blog&#x2F;ruler</a><p>Repo: <a href="https:&#x2F;&#x2F;github.com&#x2F;OpenPipe&#x2F;ART">https:&#x2F;&#x2F;github.com&#x2F;OpenPipe&#x2F;ART</a>

[Other] Show HN: Vibe Kanban – Kanban board to manage your AI coding agents