实用工具1 month ago
QTNest — Quick Tools for Instant Answers | QTNest
QTNest — 免费在线工具和生成器集合，包括是/否生成器、随机选择器、转轮和字数计数器。
@qt_nest · X
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QTNest — 免费在线工具和生成器集合，包括是/否生成器、随机选择器、转轮和字数计数器。
@qt_nest · X
Free Tools Land is a free online tools world that provide day to day tools absolutly free. One can visit and use the tools.
@Mohitkumasingla · X
一个免费的互动转盘，旋转后随机给出是或否的答案来帮助决策。
Yes or No Wheel — Spin the Yes or No Wheel - Get Your Free & Instant Decision - Struggling with a decision? Spin our free Yes or No Wheel for an instant, random answer! It's the simple, fun, and fast
Keyverse 是免费浏览器游戏系列，通过关卡教你 Mac 快捷键，无需下载。
@EjCruz77 · X
Just launched Keyverse — a free browser game that teaches you Mac keyboard shortcuts by playing, not memorizing. No install. No signup. Just open and train. #buildinpublic #indiedev #macOS
The simplest e-signature platform for busy founders. 100% free forever: unlimited signatures, templates, audit trails — no setup, no learning curve, no catch. Sign in under a minut
@GetSignFree1 · X
FreeFixo：125+ 免费计算器，涵盖金融、健康、法律、房产和旅游，无需注册。
@Arafat3599651 · X
Just launched 🧮 125+ free calculators — mortgage, BMI, debt payoff, compound interest, calories & more. No signup. No ads. Everything runs in your browser instantly. #buildinpublic #webdev #react
在数秒内将PDF转为交互式翻页书，无水印，可嵌入网站或分享。
@ZenFlipbook · X
Hey! Really excited to share ZenFlip - it turns any PDF, Word, or PowerPoint file into an interactive flipbook you can embed on any website or share via link. Feature-packed and free to get started. Would love to hear your feedback
通过 AI 反馈进行打字练习，提高速度和准确性。
@AmitGajbhare · X
We build - a modern typing platform that helps people improve typing speed and accuracy with AI-powered practice, real-time feedback, progress tracking
Memorize a chess position, rebuild it from memory, and get an instant score. Play free to train board vision, visualization, and spatial memory.
@Bing_Builds · X
在浏览器中免费转换、压缩和编辑文件，文件不上传服务器。
@faisalhaleem · X
Just launched — free browser-based file tools runs entirely in your browser. Video to GIF (with trim slider) Merge / Split / Shrink PDF Your files NEVER leave your device. No sign-up needed. Free forever. #buildinpublic #webdev #indiedev #tools #privacy
Race friends to the bottom of a procedurally generated shaft. Time trials, score attack, and 2-4 player online and split-screen racing — free in your browser, no download or accoun
@Andrew4Lyf · X
用网络摄像头手势演奏音乐，支持和弦和音高控制，无需下载或注册。
lisheng3698 · V2EX
我把摄像头变成了乐器：从手势识别到 Web Audio，分享 5 个真正踩过的坑 最近做了一个有点不一样的浏览器小项目：用摄像头识别双手动作，再把手的位置和姿势映射成和弦、音高、音量和音色。 不需要安装软件，也不需要麦克风。打开网页、允许摄像头后，就可以隔空演奏。 项目地址：[GestureSynth.me]( https://gesturesynth.me/) 建议使用最新版 Chrome 或 Edge 。摄像头画面只在本地处理，不会上传。 ## 真正难的不是“识别到手” 最开始我以为，只要 MediaPipe 能返回手部关键点，剩下的事情就是把坐标转换成音符。 实际做下来发现：**识别出一只手很容易，让它变成一个“能演奏”的控制器才难。** 摄像头每一帧都会返回一组手部关键点，但这些坐标会轻微抖动，偶尔还会丢失。如果直接把原始坐标连接到音高或者音量，听起来会非常不稳定。 最后形成的处理链路大致是： ```text 摄像头 → 手部关键点识别 → 提取手掌位置、距离和手势 → 平滑、死区和状态保持 → 映