Issue #651  (JS Libs, Testing, AI Tools)01/08/26

JS Libraries & Frameworks

Brimstone — A JavaScript engine written from scratch in Rust, aiming to have full support for the JavaScript language.

mcp-ui — A UI over MCP that allows you to create next-generation UI experiences with MCP and SDK, enabling you to define reusable UI snippets on the server side and seamlessly and securely render them in the client.

QJS — A CGO-Free, modern, secure JavaScript runtime for Go applications, built on the powerful QuickJS engine and Wazero WebAssembly runtime.

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SmallJS — An open source implementation of the elegant and powerful Smalltalk-80 OOP language, originally created in the 1970s for educational purposes.

Motia — A multi-language backend framework that unifies APIs, background jobs, queues, workflows, streams, and AI agents with a single core primitive with built-in observability and state management.

Supercharge — A full-stack Node.js framework that ships with an extensive core with features like routing, HTTP controllers, DB migrations, an integrated CLI, an SQL ORM, and more.

LeaferJS — An innovative and easy-to-use JavaScript-based Canvas engine with strong performance useful for graphics editing, mini-games, interactive apps, generating media, and more.

Granite — An enterprise-grade React Native framework for microservice apps that's designed to work with existing systems, apps, and infrastructure, has a 200kb bundle size, and is AWS-ready.

Testing & Debugging Tools

Ottrelite — Unified, extensible, cross-language tracing toolkit for React Native, allowing developers to easily instrument their apps with various backends for tracing, profiling, and performance monitoring.

ExposedByDefault — A page that lets you see your 'browser fingerprint' by showing you all the technologies and features that are exposed automatically in every page view.

JavaScript Engines Zoo — A resource that provides detailed info and benchmarks on just about every JavaScript engine or parsers you could think of.

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Browser Score — An interactive tool that tells you how your current browser fares in its support for web platform features, providing a percentage rating and giving you the choice to show/hide different types of features.

Rozenite — A tool that brings plug-and-play panels to React Native DevTools, enabling you to start debugging in minutes with no extra windows, servers, or tabs, with support for Expo and bare React Native.

CanIUse Embed — A configurable and customizable component that lets you easily embed up-to-date data from caniuse and Mozilla's browser compat data, to display feature support data for multiple versions of the 10 major browsers.

breakpoint-overlay — A TypeScript library to debug responsive layouts faster with a developer-only overlay that highlights active breakpoints, and viewport metrics.

Browser Agent — A diagnostic, cross-browser performance testing agent that outputs console errors in a JSON file, creates a video file for page load progress analysis, collects timing metrics, screenshots the final page, and more.

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AI Tools, LLMs, etc.

Anthropic Sandbox Runtime — A lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container.

Superpowers — A complete software development workflow for your coding agents, built on top of a set of composable "skills" and some initial instructions that make sure your agent uses them.

Gerbil — A GUI for running LLMs locally, handling the technical complexity of managing backends, model downloads, and hardware acceleration, letting you focus on using AI rather than configuring it.

Jetski — An open source MCP analytics and authentication platform that solves the primary problems teams face when developing MCP servers with zero code changes.

Claudable — A powerful Next.js-based web app builder that combines Claude Code's advanced AI agent capabilities with Lovable's simple and intuitive app building experience.

iCendant Chat — Privacy-focused AI chat for developing, testing, simulating, comparing, and interacting with multiple custom AI personas at once.

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erns, etc.

MCP Server for Tauri — An MCP server and plugin for Tauri (the popular cross-platform app framework) that helps you develop, test, and debug your mobile and desktop Tauri apps.

Open Agent Platform — A no-code agent building platform that enables you to build agents that can be connected to a wide range of tools, RAG servers, and other agents through an agent supervisor.

Commercial Apps & Classifieds