The CLI starter kit. A small, experimental library for batteries-included Cobra. applications.

A browser automation SDK built for developers and LLMs.

Most existing browser automation tools either require you to write low-level code in a framework like Selenium, Playwright, or Puppeteer, or use high-level agents that can be unpredictable in production. By letting developers choose what to write in code vs. natural language, Stagehand is the natural choice for browser automations in production.

• Stagehand @ GitHub.

An open source framework for building AI-powered apps with familiar code-centric patterns. Genkit makes it easy to develop, integrate, and test AI features with observability and evaluations. Genkit works with various models and platforms.

Genkit is an open-source framework for building full-stack AI-powered applications, built and used in production by Google's Firebase. It provides SDKs for multiple programming languages with varying levels of stability

Unified Backend Framework for APIs, Events and AI Agents.

Multi-language cloud functions runtime for API endpoints, background jobs, and agentic workflows using Motia Steps. Preview them in the Workbench, ship to zero-config infrastructure, and monitor in the Cloud.

• Motia @ GitHub.

Our Frontend Toolkit, Free and Open Source.

A collection of ready-to-use plugins and composables for building modern web applications. Unstyled, fully typed and with a flexible, yet opinionated API.

• Vue Equipment @ GitHub.

ombined language, editor, and infrastructure to make it easy to build backends and CLIs.

Dark is a new way of building serverless backends. Just code your backend, with no infra, framework or deployment nightmares. Build APIs, CRUD apps, internal tools and bots - whatever your backend needs.

• Darklang @ GitHub.

Related contents:

• Darklang Goes Open Source @ Darklang.

Portable Computing Language.

PoCL is a portable open source (MIT-licensed) implementation of the OpenCL standard. In addition to being an easily portable/layered multi-device open-source OpenCL implementation, a major goal of this project is improving interoperability of diversity of OpenCL-capable devices by integrating them to a single centrally orchestrated platform. Also one of the key goals is to enhance performance portability of OpenCL programs across device types utilizing runtime and compiler techniques.

• PoCL @ GitHub.

Lefthook is a Git hooks manager. Fast and powerful Git hooks manager for any type of projects.

Alternative to lint-staged.

• Lefthook @ GitHub.

Keep your code spotless.

Spotless can format <A ntlr | c | c# | c++ | css | flow | graphql | groovy | html | java | javascript | json | jsx | kotlin | less | license headers | markdown | objective-c | protobuf | python | scala | scss | shell | sql | typeScript | vue | yaml | anything> using <gradle | maven | sbt | anything>.

A collection of reusable rules and knowledge documents for AI coding assistants like Claude Code and Cursor.

AI documentation you can talk to, for every repo.

Related contents:

• DeepWiki: Understand Any Codebase @ AI Tidbits.

Tiny & fast S3 client for node and edge platforms.

s3mini is an ultra-lightweight Typescript client (~14 KB minified, ≈15 % more ops/s) for S3-compatible object storage. It runs on Node, Bun, Cloudflare Workers, and other edge platforms. It has been tested on Cloudflare R2, Backblaze B2, DigitalOcean Spaces, and MinIO. (No Browser support!)

JavaScript Library for Timezone Lookup by Location.

Fast, memory-efficient time zone estimations from latitude and longitude.

Data validation using Python type hints.

Pydantic is the most widely used data validation library for Python.

Fast and extensible, Pydantic plays nicely with your linters/IDE/brain. Define how data should be in pure, canonical Python 3.9+; validate it with Pydantic.

• Pydantic @ GitHub.

Related contents:

• Loading Pydantic models from JSON without running out of memory @ Python=>Speed.
• Software Engineering for Data Scientists, Part 1: Pydantic Is All You Need for Poor Performance Spaghetti Code @ Han, Not Solo.

Inline render-block-stable React hooks.

RenderHooks lets you place hooks right next to the markup that needs them—no wrapper components, no breaking the Rules of Hooks, and zero boilerplate, even when you supply your own custom hooks.

Core building blocks for AI apps. High-quality, accessible, and customizable components for AI interfaces.

Build chat experiences, AI agents, autonomous assistants, and more, quickly and beautifully.

• prompt-kit @ GitHub.

Enhanced developer tools for React Native applications, supporting React Query DevTools and device storage monitoring with a beautiful native interface.

Beautiful macOS app for debugging React Query in ANY React-based application (Mobile, Web, TV, VR). Monitor queries across devices in real-time with a gorgeous native interface. Features device management, query visualization, state simulation, and automatic production safety. Works with React Native, React Web, Next.js, Expo, and any platform where.

🔍 cli utility for querying the node_modules directory.

I often need to quickly check the versions of the modules installed in the node_modules directory. Current solutions like running npm list are slow and produce a lot of irrelevant output. Checking the version in the package.json file of the specific module requires more effort and doesn’t provide information about other instances of the same module.

qnm is a tool that solves this problem by providing fast and focused information about the installed modules. It supports both npm and yarn and allows you to quickly identify the versions of the modules you are interested in.

Play to create Games

A small javascript library that lets you code video games even without programming experience. Odyc.js is a tiny JavaScript library designed to create narrative games by combining pixels, sounds, text, and a bit of logic. Everything is built through code, but without unnecessary complexity: your entire game can fit in a single file.

• Odyc.js @ GitHub.

Build cross-platform .NET Applications in record time

Boost developer productivity with the most complete open-source platform and enterprise-grade tools. The Uno Platform is an Open-source platform for building single codebase native mobile, web, desktop, and embedded apps quickly.

It allows C# and WinUI XAML and/or C# code to run on all target platforms, while allowing you to control every pixel. It comes with support for Fluent, Material, and Cupertino design systems out of the box. Uno Platform implements a growing number of the WinUI APIs, such as Microsoft.UI.Xaml to build your UI, and WinRT to get cross platform access to non-UI APIs (sensors, file system, devices, etc...), to enable WinUI applications to run on all platforms with native performance.

• Uno Platform @ GitHub.

Related contents:

• Cross-platform development with Uno Platform @ Tech World With Milan Newsletter.

CJS/ESM ANSI color library for terminals, CI and Chromium-based browser consoles. Compatible with Bun, Deno, Next.JS.

Cross-platform Xcode replacement. Build and deploy iOS apps with SwiftPM on Linux, Windows, macOS.

• xtool @ GitHub.

Local-first data layer for high-performance apps. LiveStore is a next-generation state management framework based on reactive SQLite and git-inspired syncing (via event-sourcing).

LiveStore is a fully-featured, client-centric data layer (replacing libraries like Redux, MobX, etc.) with a reactive embedded SQLite database powered by real-time sync (via event-sourcing).

• LiveStore @ GitHub.

Automated AI localization for web & mobile apps.

AI localization for teams who ship fast. Translate apps, websites, and entire databases using the best LLM models.

• Lingo.dev @ GitHub.

A Static Type Checker for Python.

• Pyrefly @ GitHub.

Related contents:

• Pyrefly vs. ty: Comparing Python’s Two New Rust-Based Type Checkers @ Edward Li's Blog.

A programming language designed to fix Go’s frustrating design choices — without sacrificing its strengths 👾

Gauntlet is a programming language designed to address many of Golang’s shortcomings. It transpiles exclusively to Go code, fully supports all of its features, and integrates seamlessly with its entire ecosystem — without the need for bindings.

• Gauntlet @ GitHub.

git-spice is a tool for stacking Git branches. It lets you manage and navigate stacks of branches, conveniently modify and rebase them, and create GitHub Pull Requests or

GitLab Merge Requests from them.

It works with Git instead of trying to replace Git. Introduce it in small places in your existing workflow without changing how you work wholesale.

• git-spice @ GitHub.

Related contents:

• Boosting workflow velocity with git-spice @ Rippling Blog.
• Episode 134 @ Linux Dev Time.

🔥 Time Travel Visual Debugger for Rust. Visualize and debug Rust programs with a new lens.

• FireDBG for Rust @ GitHub.

OSV is a high-performance CSV parser for Ruby, implemented in Rust. It wraps BurntSushi's excellent csv-rs crate.

It provides a simple interface for reading CSV files with support for both hash-based and array-based row formats.

The array-based mode is faster than the hash-based mode, so if you don't need the hash keys, use the array-based mode.

A minimal, developer-friendly pretty-printer and debug dumper for Go structs, inspired by Laravel’s dump() and Symfony’s VarDumper.

godump is a developer-friendly, zero-dependency debug dumper for Go. It provides pretty, colorized terminal output of your structs, slices, maps, and more — complete with cyclic reference detection and control character escaping. Inspired by Symfony's VarDumper which is used in Laravel's tools like dump() and dd().

C3 is an evolution, not a revolution: the C-like for programmers who like C.

C3 is a programming language that builds on the syntax and semantics of the C language, with the goal of evolving it while still retaining familiarity for C programmers.

Thanks to full ABI compatibility with C, it's possible to mix C and C3 in the same project with no effort. As a demonstration, vkQuake was compiled with a small portion of the code converted to C3 and compiled with the c3c compiler.

• C3 Language @ GitHub.

Related contents:

• 2025-05-29 # Learning C3 @ alloc.dev.
• Forget Borrow Checkers: C3 Solved Memory Lifetimes With Scopes @ The C3 Blog.

The React Framework for Cloudflare.

RedwoodSDK is a React framework for building server-side web apps on Cloudflare.

• RedwoodSDK @ GitHub.

Predictive Mouse Intent Library. What if we could only prefetch data the user actually needs?

ForesightJS is a JavaScript library that predicts user intent by tracking the mouse. Great for prefetching without wasting resources.

• ForesightJS @ GitHub.

The fastest way to code multiplayer games.

Easel is a 2D game programming language that makes multiplayer as easy as singleplayer. Whether you are a beginner or expert coder, you'll love making games with Easel!

PHP Operators is a reference guide for operators old and new in the PHP programming language.

• PHP Operators @ GitHub.

Distributed, offline-first bug tracker embedded in git.

git-bug is a standalone, distributed, offline-first issue management tool that embeds issues, comments, and more as objects in a git repository (not files!), enabling you to push and pull them to one or more remotes.

Related contents:

• Code Review Can Be Better @ TigerBeetle.
• Episode #107: Git with your friends (remastered) @ Changelog & Friends.

Build PowerPoint presentations with JavaScript. Works with Node, React, web browsers, and more.

PptxGenJS lets you generate professional PowerPoint presentations in JavaScript - directly from Node, React, Vite, Electron, or even the browser. The library outputs standards-compliant Open Office XML (OOXML).

• PptxGenJS @ GitHub.

Build cross-platform desktop apps with JavaScript, HTML, and CSS.

The Electron framework lets you write cross-platform desktop applications using JavaScript, HTML and CSS. It is based on Node.js and Chromium and is used by the Visual Studio Code and many other apps.

• Electron @ GitHub.

Related contents:

• Electron ain't bad, actually @ Vaxry's blog.

The Programming Language Repository.

Codigo is a site for discovering new and trending programming languages, finding and comparing languages, stay up-to-date on the latest news and changes, see code examples and more.

Codigo uses a combination of static data about languages that is maintained and open-contribution at GitHub, as well as dynamic data from user interactions and pulled from sources such as PyPL, TIOBE and blog feeds.

• Codigo @ GitHub.

Real-time collaborative code editor built for the web

A hyper-collaborative, real-time development environment right in your browser. CodeCafé makes pair programming, teaching, and building web projects together as fluid and instant as sharing a thought.

• CodeCafé @ GitHub.

AI for Large Codebases

The first AI-native code platform that gives large projects compiler-grade context, so LLMs stay useful even when your repo spans millions of lines.

Brokk (the Norse god of the forge) is the first code assistant that understands code semantically, not just as chunks of text. Brokk is designed to allow LLMs to work effectively on large codebases that cannot be jammed entirely into working context.

• Brokk @ GitHub.

The League of Extraordinary Packages is a group of developers who have banded together to build solid, well tested PHP packages using modern coding standards.

<html> as a Response.

mono-jsx is a JSX runtime that renders <html> element to Response object in JavaScript runtimes like Node.js, Deno, Bun, Cloudflare Workers, etc.

An extremely fast Python type checker and language server, written in Rust.

Related contents:

• Pyrefly vs. ty: Comparing Python’s Two New Rust-Based Type Checkers @ Edward Li's Blog.

A debugger for Linux. Partially inspired by RemedyBG.

Mom, can we have RAD Debugger on Linux? No, we have debugger at home. Debugger at home

Feature Flags That Fit Your Worklow. Enterprise-ready, GitOps enabled, CloudNative feature management solution.

Flipt Cloud is a fully managed feature flag solution that enables you to keep your feature flags and remote config next to your code in Git.

• Flipt @ GitHub.

ThreeJS + wgpu-matrix + TypeGPU for WebGPU on Reanimated Worklets.

WebGPU Worklets allow you to run react-native-wgpu, Three.js, wgpu-matrix, and TypeGPU libraries on Reanimated Worklets on the UI Thread. With that integration, you can run smooth 3D animations backed by WebGPU using the Reanimated API and enjoy seamless integration with the Gesture Handler.

Search input query parser and React component.

A powerful search query language parser with SQL output support, inspired by Elasticsearch and Tantivy query syntax.

SQLite Multitenancy With Rails.

Related contents:

• A Can of Shardines: SQLite Multitenancy With Rails @ Julik Tarkhanov.

A Rust web framework that does not use async.

Feather is a lightweight, DX-first web framework for Rust — inspired by the simplicity of Express.js, but designed for Rust’s performance and safety.

Safer python package installs with audit and consent 𝘣𝘦𝘧𝘰𝘳𝘦 install.

Pipask is a drop-in replacement for pip that performs security checks before installing a package. Unlike pip, which needs to download and execute code from source distribution first to get dependency metadata, pipask relies on metadata from PyPI whenever possible. If 3rd party code execution is necessary, pipask asks for consent first. The actual installation is handed over to pip if installation is approved.

Artificial Neural Engine Machine Learning Library.

ANEMLL (pronounced like "animal") is an open-source project focused on accelerating the porting of Large Language Models (LLMs) to tensor processors, starting with the Apple Neural Engine (ANE).

The Black Magic Framework. Powerful Discord Bots Made Simple with Seyfert

Experience the perfect balance of power and simplicity.A modern Discord framework engineered for scalability, without sacrificing developer experience.

Seyfert is the ultimate Discord framework! We make it easy to interact with the Discord API, big cache control, scalable code and a pretty dev experience.

• Seyfert @ GitHub.

jscodeshift is a toolkit for building and running codemods over multiple JavaScript or TypeScript files.

• jscodeshift @ GitHub.

Related contents:

• From manual fixes to automatic upgrades — building the Codemod Platform at Lyft @ Lyft Engineering's Medium.

A web-app framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.

• Rails @ GitHub.

Related contents:

• Making the case for Rails monoliths over microservices @ thoughtbot.
• Part 1: How We Fell Out of Love with Next.js and Back in Love with Ruby on Rails & Inertia.js @ Hardcover.
• The One-Person Framework in practice @ Bram Jetten.
• Serving Large Files in Rails with a Reverse Proxy Server @ Write Software, Well.
• My puts Debugging Workflow in Rails Apps @ Paweł Urbanek.
• Tip: Put your Rails app on a SQL query diet @ Andrew Atkinson.
• Ruby on Rails: The Open-Source Blueprint @ The Miners.
• Engineering excellence starts on edge @ David Heinemeier Hansson.
• You're doing Rails wrong @ Banana Curving Machine.

An open source, free (as in beer), versatile, flexible and lightweight Javascript Font Picker Component for System fonts, Google fonts and custom (woff/ttf) fonts. Features dynamic font loading, favourites, keyboard navigation, fuzzy search, advanced metrics filters, property sorting and much more. Available in multiple languages.

• Javascript Font Picker @ GitHub.

Visual Code Comparison Tool.

Effortlessly compare and merge code in a responsive split‑view interface, with interactive change selection and support for over 180 programming languages.

Visual Diff-Merge is a web-based tool for comparing, selecting, and merging code changes. With a split-view interface, it lets you view two versions side by side for easy diffing and merging. Built with PHP and JavaScript, it supports automatic language detection and syntax highlighting for over 180 programming languages, including HTML, Twig, PHP, JavaScript, JSON, TypeScript, Python, Ruby, Java, C#, CSS, XML, YAML, Markdown, SQL, and many more.

• Visual-Diff-Merge @ GitHub.

A powerful, flexible, Markdown-based authoring framework.

From personal blogs to massive documentation sites, Markdoc is a content authoring system that grows with you.

Markdoc is a Markdown-based syntax and toolchain for creating custom documentation sites and experiences. We designed Markdoc to power Stripe's public docs, our largest and most complex content site.

• Markdoc @ GitHub.

Modern Zod-based CLI builder, fully type-safe, super lightweight and flexible.

snapDOM captures DOM nodes as images with exceptional speed avoiding bottlenecks and long tasks.

snapDOM is a high-fidelity DOM capture tool, developed as part of the animation engine I'm developing for Zumly — a framework for creating smooth zoom-based view transitions.

The elegant bundler for libraries powered by Rolldown.

tsdown is The Elegant Library Bundler. Designed with simplicity and speed in mind, it provides a seamless and efficient way to bundle your TypeScript and JavaScript libraries. Whether you're building a small utility or a complex library, tsdown empowers you to focus on your code while it handles the bundling process with elegance.

• tsdown @ GitHub.