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介绍了在浏览器中运行的交互式线性规划工具，让用户可以直接在网页环境里构建、求解并可视化线性规划问题。
Show HN: Fakeipedia — a Wikipedia-style site featuring encyclopedias of fictional alternate worlds, from a reality where lying causes pain to an ASI-ruled 2048, each with browsable articles.
Simon Willison 发布了一款 LaTeX 渲染工具，支持 MathJax 单公式渲染与 faster-latex 整篇文档排版，具备实时预览，并将源码存储在 URL fragment 中以便分享链接，灵感来自 Tiny Little Office 的无服务器文档方案。
Tiny Little Office 推出一套以链接为核心的在线办公工具集，包含文字处理、大纲、演示、表格、绘图、日历等 10 款应用，并提供 llms.txt 说明如何让 AI 代理以链接形式生成和嵌入文档。
Stario 推出了一款基于 Python 和超媒体架构的多人在线 Conway's Game of Life 演示应用，支持实时互动与状态同步。
Show HN: Wonderhop is a free daily word game with four modes per day where players guess the most common, rarest, oldest, or most recent answer to shared questions within 30 seconds.
Guitoro 是一款免费的在线虚拟吉他，可通过键盘、触屏或鼠标弹奏，支持 51 首歌曲逐音符演示与 20% 慢速练习，适合学习和弦与真实弹奏技巧。
Show HN: XY Music Notation — a web-based music notation and playback tool featuring an internal piano soundfont, optional external MIDI support, and playback controls.
Playgrnd 是一系列运行在浏览器中的小工具合集，用于创作怪异而美丽的作品；所有处理均在本地完成，不上传也不存储，导出成果归用户所有，且完全免费。
@jinglian 介绍并推荐“交互式教学工具集”WeduLab 的最新更新：新增 3 个工具（含 K12 化学元素周期表），累计已达 25 个开箱即用的 3D 交互式学科实验工具，覆盖物理、地理、生物、化学、数学等学科，作者 Teacher WY 计划在 Claude 可用的情况下持续更新。
Fleeting 是一款幽默的网页工具，播放由合成人声与 AI 生成画面构成的逼真"会议"录音，帮助用户在办公室制造忙碌假象以躲避打扰，还支持伪造日历会议与连播会议。
Show HN 介绍 OldRoll Web，一款免费的浏览器端复古照片编辑器，提供 Digicam、Film、Y2K、VHS 等怀旧滤镜以及曝光、色彩、贴纸和拼贴等编辑功能，无需安装且支持移动端。
Extend engineer Bo Lau built a highly detailed interactive website that simulates sitting at Elizabeth Holmes' desk, featuring real emails, texts, slides, and documents sourced from the United States v. Holmes criminal trial exhibits, including a working replica of the Theranos Edison machine.
WIRED published an interactive web feature, 'Spend Elon Musk's Money,' letting users virtually allocate the tech billionaire's fortune across purchases and donations — a lighthearted viral simulation.
Bigwords.page is a browser-based tool that turns any screen into a sign, timer, or message using nothing but a URL — no account, no server storage, and the entire content lives in the URL fragment for privacy.
Flatten SF is a browser-based tool that computes the flattest routes between any two points in San Francisco using 160,000 street segments, USGS 1 m lidar elevation data, and the Overture/OpenStreetMap street graph, with an interactive slider exploring the distance-vs-climbing trade-off. Source code and analysis are published on GitHub.
NoHope has launched 'swarm,' an experimental web-based project focused on growing and controlling swarms, currently accessible via nohope.io.
esigna is an email signature design studio launched on Product Hunt, offering 26 original templates and a visual editor to customize signatures with light, dark, and mobile previews before copying into Gmail, Outlook, or Apple Mail.
A working 3D model of the Enigma machine is showcased, providing an interactive simulation and historical insights into its use in World War II.
Best of British Design is a curated showcase of British design elements, hosted on a Vercel web application.