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HelloGitHub Issue #123 features projects spanning systems programming, web development, productivity tools, and developer utilities. Published on June 28, 2025, this issue highlights 38 open-source tools and libraries drawn from community nominations, covering C, C#, C++, Go, JavaScript, Kotlin, Python, Rust, Swift, AI, and miscellaneous hardware projects.

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Highlights

The following projects stood out this issue for their creativity, usefulness, and beginner-friendliness.

keyd — Linux Keyboard Remapper

A system-level keyboard remapping daemon for Linux built on the kernel input layer (evdev/uinput). Works across X11, Wayland, and TTY terminals without any desktop environment dependency. Supports press vs. long-press actions, custom key combos, and per-keyboard profiles.

luanti — Voxel Game Engine

An open-source voxel game creation platform where you can build your own 3D block games using Lua. Ships with a built-in content store for community mods and games, supports single-player, LAN, and multiplayer, and runs on Windows, macOS, Linux, and Android.

gopass — Team Password Manager

A command-line password manager designed for teams. Uses GPG for encryption and Git for version control and sync across devices. Serves as a modern drop-in replacement for the classic UNIX pass tool.

react-scan — React Performance Debugger

A visual debugging tool that automatically detects unnecessary re-renders in React applications. Requires zero code changes — just add a script tag or run one command. Compatible with React, Next.js, Vite, and Remix.

black — Python Code Formatter

The official PSF-maintained Python code formatter. Minimal configuration, deterministic output — run one command and your entire codebase adopts a consistent style. Eliminates style debates in teams for good.

Scrapling — Adaptive Web Scraper

A self-adapting Python scraping framework whose parser learns website structure changes and automatically re-locates target elements after page redesigns. Supports multi-session concurrency, resume-on-failure, domain blocking, and an MCP server.

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Projects by Language

keyd — github.com/rvaiya/keyd A Linux system-level keyboard remapping daemon based on the kernel input layer (evdev/uinput). Configurations take effect on X11, Wayland, and TTY without relying on the desktop environment. Supports press, long-press, custom key combinations, and per-keyboard mapping rules.mbedtls — github.com/Mbed-TLS/mbedtls A flexible, easy-to-use TLS library written in C. Implements cryptographic primitives, X.509 certificate operations, and SSL/TLS and DTLS protocols. Compact and easily portable — ideal for IoT and embedded systems with limited resources.
PaperTodo — github.com/snownico0722/PaperTodo A minimalist Windows desktop sticky-notes tool. Each note is a borderless, floating, independent window — no main window, no account, no category management. Content auto-saves. Supports to-do paper and note paper (with lightweight Markdown highlighting), can collapse into a pinned top-edge capsule, and automatically snaps to screen edges.
luanti — github.com/luanti-org/luanti An open-source voxel game creation platform. Build your own 3D block games rapidly with Lua. Features a built-in content store for downloading community mods and games, supports single-player, LAN, and multiplayer modes, and runs on Windows, macOS, Linux, and Android.SpeedyNote — github.com/alpha-liu-01/SpeedyNote A cross-platform handwritten note-taking app optimized for low-cost devices, targeting an iPad-like writing experience on old tablets. Supports pressure-sensitive writing, multi-layers, PDF annotation, and handwritten OCR. Runs on Windows, macOS, Linux, Android, and iPadOS.
chinese-poetry-api — github.com/palemoky/chinese-poetry-api A Chinese ancient poetry API service written in Go, cataloguing nearly 400,000 works including Tang poems, Song ci, and Yuan qu. Provides both REST API and GraphQL interfaces, with full-text search, IP rate limiting, random retrieval by dynasty/author/type, and one-click Docker deployment.fight-the-landlord — github.com/palemoky/fight-the-landlord A terminal-based Dou Di Zhu (Fight the Landlord) card game written in Go, featuring random dealing and no card-control algorithm. Supports online multiplayer, room matching, disconnection recovery, a card recorder, and integrates Kuaishou’s open-source DouZero AI as a bot opponent.gopass — github.com/gopasspw/gopass A command-line tool for storing, managing, and syncing passwords, keys, and certificates — a modern replacement for the UNIX pass tool. Uses GPG for encryption and Git for credential management, enabling sync across multiple devices and teams via Git repositories.tinyauth — github.com/tinyauthapp/tinyauth A minimalist Go-based authentication middleware deployable via Docker in minutes. Adds a login screen or OAuth logins (Google, GitHub, etc.) to any web service without touching existing code. Integrates seamlessly with Traefik, Caddy, and Nginx reverse proxies.
emdash — github.com/emdash-cms/emdash A serverless CMS built on Astro, designed as a WordPress alternative. Features WordPress import, visual editing, full-text search, and scheduled publishing. Runs directly on Cloudflare Workers or local Node.js + SQLite environments.r2-web — github.com/vikiboss/r2-web A pure front-end Cloudflare R2 cloud-storage file manager. Open the page, enter your R2 credentials, and manage bucket files directly. Includes built-in image, video, audio, and text preview, drag-and-drop / paste uploads, image compression, and batch management.react-scan — github.com/aidenybai/react-scan A visual debugging tool that detects React performance issues automatically. No code changes required — add a script tag or run one command. Highlights components with unnecessary re-renders. Supports React, Next.js, Vite, and Remix.tiny-world-builder — github.com/jasonkneen/tiny-world-builder A browser-based 3D voxel world editor built with Three.js — a mini Minecraft-style creative sandbox. No installation needed. Build terrain, roads, rivers, houses, crops, and props. Supports local save, import/export, and vehicle pathfinding with obstacle avoidance.tolaria — github.com/refactoringhq/tolaria A desktop app for managing Markdown knowledge bases where each knowledge base is a Git repository, providing built-in version history and change tracking. Notes are stored as plain Markdown files and are always portable. Includes a built-in MCP server for use with Claude Code, Codex, and other AI tools.
shiguangschedule — github.com/XingHeYuZhuan/shiguangschedule An open-source Android course schedule app for Chinese university students and teachers. Supports one-click import from different university academic systems via adapter scripts. Features today’s schedule view, home-screen widgets, and automatic silent/do-not-disturb mode during class hours.
ASCILINE — github.com/YusufB5/ASCILINE A cross-platform real-time ASCII video rendering engine capable of smooth 30 FPS playback. Supports direct URL streaming, audio-video sync, and adaptive frame encoding/decoding. Runs without a GPU in ASCII mode.black — github.com/psf/black The official Python Software Foundation (PSF) code formatter. Minimal configuration and deterministic output — one command transforms a codebase to a unified style. Eliminates code style debates in teams permanently.mpmath — github.com/mpmath/mpmath A Python library for arbitrary-precision numerical computation. Supports root finding, linear algebra, calculus, and real and complex number operations. Ideal for high-precision scenarios where standard floating-point arithmetic falls short.Scrapling — github.com/D4Vinci/Scrapling An adaptive Python web-scraping framework. The parser learns website structure and automatically re-locates target elements after a page redesign. Features built-in scrapers, multi-session concurrency, resume-on-failure, domain blocking, and an MCP server.winpodx — github.com/kernalix7/winpodx A Linux tool that runs Windows applications as native Linux windows without requiring a full Windows desktop. Uses a containerized Windows instance in the background and FreeRDP to project each app as an independent window. Supports taskbar pinning, Alt-Tab switching, file associations, and USB devices.
llmfit — github.com/AlexsJones/llmfit A terminal tool written in Rust that automatically detects local CPU, GPU, and RAM specs and recommends large language models suited for local inference. Scores and ranks models across quality, speed, compatibility, and context dimensions. Supports Ollama, llama.cpp, MLX, vLLM, and LM Studio.rerun — github.com/rerun-io/rerun A multimodal data visualization platform built for robotics and physical AI. Supports images, point clouds, time-series data, and joint states across time. Features a built-in real-time viewer with playback and multi-sensor comparison, DataFrame/SQL querying, and Python, Rust, and C++ SDKs.smolvm — github.com/smol-machines/smolvm A lightweight virtual machine manager with sub-second cold start times. Delivers container-like UX with VM-level isolation, Docker image compatibility, and the ability to bundle a VM into a single portable executable for easy migration and deployment.
academic-research-skills — github.com/Imbad0202/academic-research-skills A Claude Code skill pack for academic research. Delegates tedious tasks — literature search, citation verification, data checking, logical consistency review, and writing style calibration — to AI, letting researchers focus on posing questions, choosing directions, and interpreting results.ponytail — github.com/DietrichGebert/ponytail A skill pack that injects a code-minimizing senior engineer’s mindset into your AI coding assistant. Prevents over-engineering and keeps code lean — reported to cut code volume by ~54%, cost by ~20%, and time by ~27%.stop-slop — github.com/hardikpandya/stop-slop A writing skill pack that strips AI-flavored patterns from generated text. Instructs the model to avoid boilerplate openers, corporate jargon, dramatic pivots, and hollow aphorisms when generating, polishing, or reviewing writing.text-to-cad — github.com/earthtojake/text-to-cad A skill pack that gives AI agents CAD modeling capabilities. Supports generating, modifying, and validating CAD models from natural language or reference images. Uses STEP as the primary format, with STL/3MF/GLB export, URDF/SRDF/SDF robot description file generation, and in-browser local preview.
Atoll — github.com/Ebullioscopic/Atoll A SwiftUI macOS app that transforms the MacBook notch into a Dynamic Island-style control center. Sits hidden at the top of the screen and surfaces Apple Music/Spotify media controls, CPU/GPU/memory monitoring, a timer, clipboard history, and calendar preview via gesture control. Also provides lock-screen widgets.MacTools — github.com/ggbond268/MacTools A free, open-source macOS menu bar utility that consolidates common system actions — sleep prevention, auto-hide Dock, system mute, Xcode cache cleanup, disk eject, empty Trash, IP lookup, and translation — into a single menu bar icon.
CapsWriter-Offline — github.com/HaujetZhao/CapsWriter-Offline A fully offline voice input tool. Hold CapsLock to speak, release to convert speech to text. Supports real-time speech recognition, audio file transcription, number format conversion, hotword replacement, and LLM polishing. All recordings stay local; can run from a USB drive.GOD — github.com/XiaoLuoLYG/GOD A local-first multi-agent simulation and live control platform. Unlike passive agent simulators, it supports real-time pause/replay, injecting intervention commands, querying individual or all agents, one-click world reset, and multiple map packs.OpenMAIC — github.com/THU-MAIC/OpenMAIC A multi-agent interactive classroom platform developed by a Tsinghua team. Converts any topic or document into an immersive AI-taught course where AI teachers and agent classmates lecture, discuss, and interact in real time. Includes whiteboard drawing, voice synthesis, PPT/interactive-webpage export, 3D visualization, simulations, mini-games, mind maps, and online coding.train-llm-from-scratch — github.com/FareedKhan-dev/train-llm-from-scratch A hands-on tutorial for training large language models from scratch. Goes beyond calling Transformers for a demo — uses PyTorch to implement the full pipeline: Transformer architecture, pre-training, supervised fine-tuning, reward modeling, and evaluation.vllm-omni — github.com/vllm-project/vllm-omni An omni-modal inference and serving framework from the official vLLM team. Extends vLLM with image, video, and audio input and generation, and supports both autoregressive models and non-autoregressive diffusion Transformer (DiT) models.
Echo-Loop — github.com/echo-loop/Echo-Loop An app focused on English listening and speaking practice that helps users go from completely unfamiliar with an audio clip to understanding and reproducing it. Supports local audio and subtitle import, sentence-by-sentence listening, phrase grouping, shadowing with scoring, and passage dictation. New vocabulary is saved as flashcards with the original sentence context for review.micro-radar — github.com/AnthonySturdy/micro-radar An open-source desktop flight radar based on the ESP32-C3 microcontroller. Fetches real-time nearby flight data from the OpenSky API via Wi-Fi and displays it on a 1.28-inch circular screen.optocamzero — github.com/dorukkumkumoglu/optocamzero A pocket-sized DIY digital camera built on a Raspberry Pi Zero. Features a 1.4-inch LCD screen and autofocus camera, and supports shooting 2592×2592-pixel photos, GIF recording, 8 filters, and Wi-Fi photo transfer.tab-harbor — github.com/V-IOLE-T/tab-harbor A Chrome new-tab extension that turns the new-tab page into a browser workspace, automatically grouping tabs by domain. Supports manual grouping, quick links, session save/restore, one-click duplicate-tab cleanup, tab hibernation, and keeps all data stored locally.

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Read the Full Issue

GitHub — Chinese

Read the original Chinese Markdown source on GitHub.

GitHub — English

Read the English translation of Issue #123 on GitHub.

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