Juho Vepsäläinen

utils. A collection of utility functions.

elkjs. ELK's layout algorithms for JavaScript

merman. Mermaid.js, but headless, in Rust.

disk-perf-git-and-pnpm. Stress test for parallel disk i/o using git and pnpm

unpdf. 📄 PDF extraction and rendering across all JavaScript runtimes

basically-agent-evals. TypeScript

codex-relay. Use Codex from your phone while the real work stays on your computer.

sse-bomb. Tiny Node.js SSE payload growth tester for EventSource limits.

codiff. a fast local diff viewer

cow-factory. OpenSCAD 3D model generation & refinement pipeline with a silly website for comparing LLMs.

parsehawk. Turn documents into structured JSON with local-first document AI. Run 100% locally by default, with API, CLI, and Web UI.

iq. fastest interactive jq ⚡

satteri. High-performance Markdown and MDX processing for the JavaScript ecosystem

webmcp. 🤖 WebMCP

cli. Google Workspace CLI — one command-line tool for Drive, Gmail, Calendar, Sheets, Docs, Chat, Admin, and more. Dynamically built from Google Discovery Service. Includes AI agent skills.

whisper.cpp. Port of OpenAI's Whisper model in C/C++

SkillSpector. Security scanner for AI agent skills. Detect vulnerabilities, malicious patterns, and security risks.

fallow. Codebase intelligence for TypeScript and JavaScript. Free static analysis of code and styles: unused code, duplication, circular deps, complexity hotspots, architecture boundaries, design-system drift. Optional paid runtime layer (Fallow Runtime): hot-path review and cold-path deletion evidence from real production traffic.

workout-gate. A Claude Code hook that blocks your prompt until you do your push-ups, counted live via webcam. Random reps, session-persistent debt (no closing the tab to skip), streak stats, and three trigger modes. Your AI works hard, so should you.

headroom. Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.

piper1-gpl. Fast and local neural text-to-speech engine

kokoro. https://hf.co/hexgrad/Kokoro-82M

fsberlin. A file-hierarchy substrate for human–AI project collaboration. Cards are folders, waypoints are overlays, agents are first-class users; the filesystem is the lingua franca. Local-first, git-native, no lock-in — humans edit in any tool, AIs use ls/cat/rg, both read and write the same plain text.

hacs_gree_versati. Gree Versati Air to Water Heat Pump integration for HomeAssistant

zerolang. The Programming Language for Agents

openapi-directory. 🌐 Wikipedia for Web APIs. Directory of REST API definitions in OpenAPI 2.0/3.x format

lite3. A JSON-Compatible Zero-Copy Serialization Format

scicomp-docs. Aalto scientific computing guide: former Triton user guide + more info

weareonhire. Professional networking platform

michael-tcq. TypeScript

fnox. encrypted/remote secret manager

ai-assisted-engineering. A Guide To AI-Assisted Software Engineering

dembrandt-skills. Senior-level UX and design-system knowledge, packaged so your AI agent applies it automatically.

d1-tags. Tagged-template helpers for Cloudflare D1

code-review-graph. Local-first code intelligence graph for MCP and CLI. Builds a persistent map of your codebase so AI coding tools read only what matters, with benchmarked context reductions on reviews and large-repo workflows.

yuku. High-performance JavaScript/TypeScript compiler toolchain in Zig.

rtk. CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies

cavekit. A Claude Code plugin that turns natural language into blueprints, blueprints into parallel build plans, and build plans into working software with automated iteration, validation, and cross-model peer review.

caveman. 🪨 why use many token when few token do trick — Claude Code skill that cuts 65% of tokens by talking like caveman

cornucopia. The source files and tools needed to build the OWASP Cornucopia decks in various languages

graphify. Turn any codebase, with its docs, SQL schemas, configs, and PDFs, into a queryable knowledge graph. A /graphify skill for Claude Code, Cursor, Codex, and Gemini CLI: local deterministic AST parsing, every edge explained, no vector store.

serena. A powerful MCP toolkit for coding, providing semantic retrieval and editing capabilities - the IDE for your agent

html-in-canvas.

ai-marketing-skills. Open-source AI marketing skills — growth experiments, sales pipeline, content ops, outbound, SEO, and finance automation

emdash. EmDash is a full-stack TypeScript CMS based on Astro; the spiritual successor to WordPress

get-shit-done. A light-weight and powerful meta-prompting, context engineering and spec-driven development system for Claude Code by TÂCHES.

magentic-ui. MagenticLite is an experimental agent that works across the browser and local file system

skills.

agent-lightning. The absolute trainer to light up AI agents.

agent-ci. Agent-CI is local GitHub Actions for your agents.

shadify. Stream AI generated Shadcn components, not just text.

editor. Create and share 3D architectural projects.

amnesia.

spiceflow. Simple API & React framework, fully type safe, OpenAPI, RSC, MCP, type safe client, streaming with SSE

hyperstar. Server-driven UI for real-time web apps. No client code, no state sync, just TypeScript & JSX on the server, and every client sees the same thing

HtmlFlow-Datastar. Type-Safe Hypermedia-First DSL for Reactive Backend-Driven Web Applications

acolyte. A terminal-first AI coding agent. Open-source, single-pass lifecycle, on-demand memory, and transparent execution

json-render. The Generative UI framework

generative-ui. Generative UI examples for: AG-UI, A2UI/Open-JSON-UI, and MCP Apps.

state-surface. A state-layout mapping runtime where the server owns state and the client owns DOM projection. MPA pages with NDJSON streaming updates.

penpot. Penpot: The open-source design platform for Product teams that need scalable collaboration.

agent-party-planner. A themed agent orchestrator scaffolder

varlock. AI-safe .env files: Schemas for agents, Secrets for humans.

superset. Code Editor for the AI Agents Era - Run an army of Claude Code, Codex, etc. on your machine

better-all. Better Promise.all with automatic dependency optimization

write-assist-ai. OpenAI-powered Text Rewriter for VS Code. Works with Markdown, LaTeX, quarto, typst and text files. Fully customisable through settings.

PolyPane-Config. Some useful groups of panes for accessibility testing

hyperlith. Hyperlith: the hypermedia based monolith

ketting. The HATEOAS client for javascript

traverson. A Hypermedia API/HATEOAS Client for Node.js and the Browser

mquickjs. Public repository of the Micro QuickJS Javascript Engine

blender-react. A Blender addon that lets you create and manage 3D scenes using React components

seed. Desktop+Web app for self-publishing, powered by the open Hypermedia protocol

ytmdesktop. A Desktop App for YouTube Music

vscode-custom-css. Custom CSS Plugin for Visual Studio Code. Based on vscode-icon

opentype.js. Read and write OpenType fonts using JavaScript.

OpenDTU-Database. Software for ESP32 to talk to Hoymiles Inverters with Database

vs-code-custom-ui-font. Customize the UI font of Visual Studio Code with ease. Tailor your coding environment to your preferences.

datastar. The hypermedia framework.

dillo. NO LONGER UPDATED!, see https://dillo-browser.org/news/migration-from-github/. New repo at https://git.dillo-browser.org/dillo/

LLM4SE_SLR. Large Language Models for Software Engineering: A Systematic Literature Review

letta. Platform for stateful agents: AI with advanced memory that can learn and self-improve over time.

Finlandica. The official typeface of Finland

twcss. A tiny Tailwind alternative

BetterDisplay. Unlock your displays on your Mac! Flexible HiDPI scaling, XDR/HDR extra brightness, virtual screens, DDC control, extra dimming, PIP/streaming, EDID override and lots more!

at-a-star-firehose. Demo using Datastar to render a filterable view of the Bluesky atproto firehose

alien-signals. 👾 The lightest signal library

idiomorph. A DOM-merging algorithm

web-fragments. A radically different micro-frontends solution that actually works and is easy to incrementally adopt.

beads. Beads - A memory upgrade for your coding agent

webrtc-ai-voice-chat. A WebRTC server that allows you to interact with an LLM using your speech and responds back with generated audio.

uptake. Run a Bun/Deno cluster with a shared "worker" module.

aidd. The standard framework for AI Driven Development

release. Minimalistic, opinionated, and predictable release automation tool.

react-esi. React ESI: Blazing-fast Server-Side Rendering for React and Next.js

uv. An extremely fast Python package and project manager, written in Rust.

spec-kit. 💫 Toolkit to help you get started with Spec-Driven Development

ccpm. Project management skill system for Agents that uses GitHub Issues and Git worktrees for parallel agent execution.

LitSift. LitSift: Seamlessly search, sift, and export results from Semantic Scholar to BibTeX/CSV

declarative-partial-updates. Bikeshed

swiper. Most modern mobile touch slider with hardware accelerated transitions

reverse-linear-sync-engine. A reverse engineering of Linear's sync engine. Endorsed by Linear CTO.

daisyui. 🌼 🌼 🌼 🌼 🌼  The most popular, free and open-source Tailwind CSS component library

ripple. the elegant TypeScript UI framework

Obs.js. Context-aware web performance for everyone

mastro. The simplest web framework and site generator yet – no bloat, no bundler, no client-side JS by default.

pear-desktop. Pear 🍐 is extension for music player

file-tree. A file tree component for the web

vibepad. JavaScript

open-lovable. 🔥 Clone and recreate any website as a modern React app in seconds

maple-font. Maple Mono: Open source monospace font with round corner, ligatures and Nerd-Font icons for IDE and terminal, fine-grained customization options. 带连字和控制台图标的圆角等宽字体，中英文宽度完美2:1，细粒度的自定义选项

jj. A Git-compatible VCS that is both simple and powerful

html. HTML Standard

jqjs. Pure-JavaScript implementation of the jq JSON query language

spedescript. SpedeScript ohjelmointikieli

context7. Context7 Platform -- Up-to-date code documentation for LLMs and AI code editors

dev-to-mcp. A remote Model Context Protocol (MCP) server for interacting with the dev.to public API without requiring authentication.

filter-journal-spam. spamassassin blocked-list to avoid traffic from predatory publishers

zed-fonts. The Zed Mono and Sans typefaces, custom built from Iosevka

system-exploration-g. Unofficial documentation for GitHub Spark, generated with GitHub Spark

better-auth. The most comprehensive authentication framework

tsl. An extension of tsc for type-aware linting

ERNIE. The official repository for ERNIE 4.5 and ERNIEKit – its industrial-grade development toolkit based on PaddlePaddle.

boa-stack-img-transformer. TypeScript

NativeOverleaf. Next-level academia! Repository for the Native Overleaf project, attempting to integrate Overleaf with native OS features for macOS, Linux and Windows.

claude-task-master. An AI-powered task-management system you can drop into Cursor, Lovable, Windsurf, Roo, and others.

tinychat-at-proto. Group chat over atproto exploration

pastel. A command-line tool to generate, analyze, convert and manipulate colors

lift-html. TypeScript

ratatui-wgpu. A wgpu based rendering backend for ratatui.

upbge. UPBGE, the best integrated game engine in Blender

zine. Fast, Scalable, Flexible Static Site Generator (SSG)

livestore. LiveStore is a next-generation state management framework based on reactive SQLite and built-in sync engine.

nordpool-predict-fi. A Python app and ML model that predicts spot prices for the Nordpool FI market.

rust-web-framework-comparison. A comparison of some web frameworks and libs written in Rust

next-yak. 🦀 Zero-runtime CSS-in-JS powered by Rust. Write styled-components syntax, get build-time CSS extraction and full RSC compatibility

typescript-process-document. Draft of the TypeScript Process Document. Authors: Asbjørn Olav Orvedal (@asborv) and Mikhail Barash (@mikbar-uib) - University of Bergen, Norway.

zip-captions. Open source browser closed-caption generator

explode-js. Automated Exploit Generation for Node.js Packages

mono. 99% of Queries in Zero Milliseconds

little-vdom. 🍼 650B Virtual DOM - Use reactive JSX with minimal overhead

tc39_proposals_project. Analysis of the Evolution of JavaScript

melody-auth. A turnkey OAuth & authentication system, designed for both Cloudflare Workers and Node.js

the-book-of-secret-knowledge. A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.

nordcraft. Packages that are used internally by the Nordcraft engine

principles-of-web-accessibility. How to approach accessible web interface design

revolt-llm. TypeScript

orpc. Typesafe APIs Made Simple 🪄

mastra. Mastra is the modern TypeScript framework for AI-powered applications and agents.

power-flow-card-plus. A power distribution card inspired by the official Energy Distribution card for Home Assistant

zsh-autosuggestions. Fish-like autosuggestions for zsh

diverce. vercel nextjs -> cloudflare workers

ts-blank-space. A small, fast, pure JavaScript type-stripper that uses the official TypeScript parser.

servers. Model Context Protocol Servers

SVGDreamer. [CVPR 2024] Official implementation for "SVGDreamer: Text Guided SVG Generation with Diffusion Model" https://arxiv.org/abs/2312.16476

quansync. "Superposition" between sync and async

gibberlink. Two conversational AI agents switching from English to sound-level protocol after confirming they are both AI agents

unstorage. 💾 Unstorage provides an async Key-Value storage API with conventional features like multi driver mounting, watching and working with metadata, dozens of built-in drivers and a tiny core.

wappalyzer-next. detect technologies with wappalyzer alternative

style-observer. Run JS when a CSS property changes. Any CSS property.

buffered-clone. A structured clone equivalent able to encode and decode as a buffer.

greeclimate. Python package for controlling Gree based minisplit systems

cal.diy. Scheduling infrastructure for absolutely everyone.

greeclimate. Python package for controlling Gree based minisplit systems

EspHome-Gree. DIY gree versati modbus interface based on ESPHome

LaTeXML. LaTeXML: a TeX and LaTeX to XML/HTML/ePub/MathML translator.

openauth. ▦ Universal, standards-based auth provider.

workers-graphql-server. 🔥Lightning-fast, globally distributed Apollo GraphQL server, deployed at the edge using Cloudflare Workers

browsertime. Measure and Optimize Web Performance

imagetools. Load and transform images using a toolbox :toolbox: of custom import directives!

crosspost. A JavaScript utility for posting across multiple social networks at once

spam. Collection of academic and pseudo-academic events, publications and web sites that spam me

nanostores. A tiny (340 bytes) state manager for React/RN/Preact/Vue/Svelte with many atomic tree-shakable stores

pkg.pr.new. 📦️ Continuous (Preview) Releases for your libraries!

potree. WebGL point cloud viewer for large datasets

repomix. 📦 Repomix is a powerful tool that packs your entire repository into a single, AI-friendly file. Perfect for when you need to feed your codebase to Large Language Models (LLMs) or other AI tools like Claude, ChatGPT, DeepSeek, Perplexity, Gemini, Gemma, Llama, Grok, and more.

LLM-Agent-Paper-List. The paper list of the 86-page SCIS cover paper "The Rise and Potential of Large Language Model Based Agents: A Survey" by Zhiheng Xi et al.

EvoMaster. The first open-source AI-driven tool for automatically generating system-level test cases (also known as fuzzing) for web/enterprise applications. Currently targeting whitebox and blackbox testing of Web APIs, like REST, GraphQL and RPC (e.g., gRPC and Thrift).

is-odd-ai. Why check if something is odd simply, when you can do it with ✨AI✨

swarm. Educational framework exploring ergonomic, lightweight multi-agent orchestration. Managed by OpenAI Solution team.

agentic. Your API ⇒ Paid MCP. Instantly.

state-ref. Universal state management library that can be easily integrated into UI libraries

_hyperscript. a small scripting language for the web

supervision. We write your reusable computer vision tools. 💜

modern-font-stacks. System font stack CSS organized by typeface classification for every modern operating system

Pepper. Tagged template literal based JS view library for HTML / DOM

wasm-techno. MDX

smartknob. Haptic input knob with software-defined endstops and virtual detents

drupaljs. JavaScript

pyenv. Simple Python version management

next-plausible. Simple integration for https://nextjs.org and https://plausible.io analytics

KaibanJS. KaibanJS is a JavaScript-native framework for building and managing multi-agent systems with a Kanban-inspired approach.

polar. Polar — A billing platform for the intelligence era

OpenDTU. Software for ESP32 to talk to Hoymiles/TSUN/Solenso Inverters

pglite. Embeddable Postgres with real-time, reactive bindings.

style-observer. MutationObserver for CSS. Get notified when the computed value of a CSS property changes.

instant. Instant is the best backend for AI-coded apps. You get auth, permissions, storage, presence, and streams — everything you need to ship apps your users will love.

lookscanned.io. 📚 LookScanned.io - Make your PDFs look scanned

WasmEdge. WasmEdge is a lightweight, high-performance, and extensible WebAssembly runtime for cloud native, edge, and decentralized applications. It powers serverless apps, embedded functions, microservices, smart contracts, and IoT devices.

midscene. AI-powered, vision-driven UI automation for every platform.