prototyping

🎨 Best DeepSeek Harness Design Plugin. The open-source Claude Design alternative. 🖥️ Local-first desktop app. 🖼️ Your coding agent becomes the design engine: prototypes, landing pages, dashboards, slides, images & video — real files, HTML/PDF/PPTX/MP4 export. 🤖 Claude Code / Codex / Cursor / DeepSeek Harness / OpenCode & 20+ CLIs via BYOK.

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

The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

Run Claude Design locally as an Agent Skill — Cursor, Claude Code & more. Produce polished UI mockups, prototypes, decks & wireframes as self-contained HTML, without claude.ai/design. Best with Opus 4.8.

Agent skills for useful HTML artifacts, wireframes, interactive prototypes, plans, and diagrams.

A Ruby DSL for prototyping card games.

DeepSeek Harness 可编辑设计系统：AI 生成、可视化编辑、模板市场与 PPT｜Native Design & PPT Studio for DeepSeek Harness.

Mmock is an HTTP mocking application for testing and fast prototyping

Charm: A Framework for Rapidly Prototyping Cryptosystems

Flexible layout tool for creating UI on any platform

Web based diagramming app that lets you build interactive diagrams and prototypes

A platform for packaging and launching blockchain infra. Think docker compose for blockchain