TypeScript Libraries and Tools Page 5 of 6

Visimer brings “what you see is what you get” editability to Mermaid diagrams. Rename labels, change shapes, add new nodes, etc. by live editing the rendered diagram.

Rstest is a testing framework powered by Rspack. It delivers comprehensive, first-class support for the Rspack ecosystem, enabling seamless integration into existing Rspack-based projects.

Next-gen, Pusher-compatible, open-source WebSockets server. Simple, fast, and resilient.

The MathLive library includes a <math-field> web component that provides an easy-to-use interface for editing math.

Jazz is an open-source framework for building local-first apps, removing 90% of the backend and infrastructure complexity. Get real-time sync, storage, auth, permissions, instant UI updates, file uploads, and more — all on day one.

A production-grade animation library for the web. Free and open source. Create stunning web animations for React, JavaScript and Vue.

Toolcraft is an open-source starter kit and UI library for building custom design apps with AI. Use it to create small creative products, internal utilities, interactive experiments, and tools tailored to your workflow.

Visual precision for building with coding agents. Measure, inspect, and capture exactly what you see in the browser.

wraplet is a small JavaScript/TypeScript framework for projects that work directly with the actual DOM (server-rendered apps, jQuery legacy, multipage sites, plain HTML, etc.).

MCPcat is an analytics platform for MCP server owners 🐱. It captures user intentions and behavior patterns to help you understand what AI users actually need from your tools — eliminating guesswork and accelerating product development all with one-line of code.

DeepSeek Harness (dsh) is an open-source agent harness from DeepSeek AI for building and running customizable AI agents. Its everything-is-a-plugin architecture, powered by Cordis, makes models, tools, skills, sessions, sandboxes, storage, scheduling, UI and other capabilities...

A fun, interactive spinner wheel built with React and TypeScript — ideal for random name picking, raffles, giveaways, classroom activities, and more!.

Pdfnative is a next-generation PDF generation library built from the ground up in pure TypeScript. It requires zero runtime dependencies and delivers enterprise-grade PDF compliance including ISO 32000-1 (PDF/A) at four conformance levels.

A framework for building terminal apps, built on OpenTUI + React. Gridland apps work in the browser and terminal.

Animated page transition for major SSR frameworks and browsers, including Safari.

Write actions, a database schema, and auth as TypeScript files in a typebase/ folder inside your app. Your frontend calls them like local functions, end-to-end typed, zero REST boilerplate.

Headless, type-safe, composable tools for building modern web applications that work naturally for developers and reliably for agents.

Rslib is a library development tool that leverages the well-designed configurations and plugins of Rsbuild, empowering library developers to take advantage of the extensive knowledge and ecosystem of webpack and Rspack.

MCP server that finds MCP servers. Discovers, evaluates, and installs 25K+ MCP servers across Official Registry, Glama, and Smithery for any AI client (Claude, Cursor, Cline, Windsurf).

Runtime TypeScript and ESM support for Node.js.

Bits UI is a headless component library for Svelte focused on developer experience, accessibility, and full creative control. Use it to build high-quality, accessible UIs without giving up styling freedom or performance.

The fast, free, open-source technical SEO + GEO crawler — built for humans and agents.

An advanced 3D Gaussian Splatting renderer for Three.js.

Datastar is a lightweight framework for building everything from simple sites to real-time collaborative web applications.

Turn any Agent Skill (SKILL.md) into a callable API via POST /run. Multi-model, stateful, open source.