Open source whiteboards and diagram tools, tested

⭐️ Companies that don't have a broken hiring process

What the test found: Dependencies installed, lint plugin pipeline loaded, and remark-lint reports zero issues on the full README.md. 2 minutes.

:art: Diagram as Code for prototyping cloud system architectures

What the test found: diagrams 0.25.1 installed with graphviz 14.1.2; all 56 tests pass; CLI and programmatic diagram generation produce valid PNG output. 3 minutes.

开源白板工具（SaaS），一体化白板，包含思维导图、流程图、自由画等。All in one open-source whiteboard tool with mind, flowchart, freehand and etc.

What the test found: Full install completes cleanly with Node.js 20.20.2, all 29 unit tests pass across 4 Nx projects (drawnix: 9 files/26 tests, react-board: 1/1, react-text: 1/1, web: 1/1), and the Vite dev server serves the web application on port 7200 responding HTTP 200. 4 minutes.

Draws simple SVG flow chart diagrams from textual representation of the diagram

What the test found: flowchart.js builds, parses DSL, and renders SVG flowcharts in the browser via the dev server, confirmed with Puppeteer headless browser. 8 minutes.

FlowGram is an extensible workflow development framework with built-in canvas, form, variable, and materials that helps developers build AI workflow platforms...

What the test found: FlowGram monorepo builds successfully (73/73 Rush projects), all tests pass across 9 packages with vitest (0 failures), and the demo-free-layout app serves correctly via Rsbuild dev server answering HTTP 200. 15 minutes.

Convert your ascii diagram scribbles into happy little SVG

What the test found: The svgbob workspace builds, all 110 tests pass, the CLI converts ASCII diagrams to valid SVG, and the server serves HTTP on port 3000. 2 minutes.

Interactive React Lifecycle Methods diagram.

What the test found: The React Lifecycle Methods Diagram builds successfully via Vite 8, TypeScript compiles cleanly, lint passes, and the dev server serves the interactive diagram on localhost:5173 with HTTP 200. 10 minutes.

A modern commutative diagram editor for the web.

What the test found: The quiver commutative diagram editor builds successfully with all dependencies (KaTeX, Workbox, icons), serves via python3 http.server on port 8000, and loads in Chromium with zero JavaScript errors and full UI rendering. 6 minutes.

:ocean: Digital timing diagram rendering engine

What the test found: WaveDrom v3.7.0 installs and runs: npm test passes (eslint 0 errors, 6 mocha tests pass, 79.8% statement coverage), CLI outputs valid SVG from JSON5 input, and all 4 distribution bundles build successfully. 3 minutes.

The sassy UML diagram renderer

What the test found: nomnoml v1.7.0 library and CLI are installed, all 132 unit tests pass, and both the API (renderSvg) and CLI produce valid SVG output from nomnoml syntax. 2 minutes.

🎨 A powerful multi-end drawing board that brings together a lot of creative brushes to experience a whole new range of drawing effects!

What the test found: paint-board v2.0.0 (paint-board) builds and serves correctly via Vite. The dev server (pnpm dev) starts and returns HTTP 200 on /paint-board/. All application JS/CSS assets compile cleanly. 22 minutes.

Answer me with HTML, an agent skill that answers hard questions with a one-page HTML you can actually read. 让 AI Agent 用一页 HTML 回答复杂问题。

What the test found: npm install added 6 packages with 0 vulnerabilities; all 193 tests pass; am CLI renders examples to self-contained HTML files with SVG diagrams, STE writing checks, blueprint and shadcn themes, and supports render/lint/config/patch/video subcommands. 4 minutes.

PlantUML Class Diagram Generator for golang projects

What the test found: GoPlantUML builds with Go 1.22.2, installs as a goplantuml binary, all 46 parser tests pass, and the binary runs against real Go source directories to emit valid PlantUML diagrams to stdout and files. 4 minutes.

Read your tfstate or HCL to generate a graph specific for each provider, showing only the resources that are most important/relevant.

What the test found: The Go project builds cleanly, all 8 test packages pass, and the binary prints correct version output, generates DOT graphs from both tfstate and HCL inputs, and prunes sensitive fields from state files. 3 minutes.

A fast native Rust Mermaid diagram renderer. No browser required. 500-1000x faster than mermaid-cli.

What the test found: mmdr 0.3.1 installs, builds, and renders Mermaid diagrams to SVG and PNG. Unit tests (386 passed), layout tests (28 passed, including the fixed quadrant test), and all fast integration suites pass. 55 minutes.

Vue components for the Konva 2d canvas library. Build interactive graphics, design editors, and whiteboards in Vue.

What the test found: Standard npm install succeeded and, when run on Node 22, npm test exits 0 with 62 passing tests and npm run build exits 0 producing dist bundles (vue-konva.js, vue-konva.umd.js, vue-konva-core.js) plus .d.ts declarations; no tracked repo files were modified. 5 minutes.

Agent skill that turns natural language, code, Terraform/K8s, SQL, OpenAPI, AsyncAPI, Protobuf and GraphQL sources into editable, tested draw.io architecture...

What the test found: The drawio-skill project runs fully: 174 unit tests pass, the diagramctl CLI (12 subcommands) works end-to-end for core semantic workflows, all importers produce correct IR, the MCP server responds with 9 tools, and the shape/index/validate infrastructure is operational. Only the draw.io desktop binary (for native... 10 minutes.

React components for the Konva 2d canvas library. Build interactive graphics, design editors, and whiteboards with JSX.

What the test found: All 196 browser tests pass against Chromium, TypeScript checks pass, the build produces es/ and lib/ output, SSR rendering succeeds across CommonJS and ES module entry points, package exports resolve correctly in ESM/CJS/Node10/Bundler modes, and DevTools registration and canvas commits are functional. 30 minutes.

📊 Vue.js wrapper for Chart.js

What the test found: The vue-chartjs repository installs, lints, builds, and runs all 24 unit tests successfully with pnpm 12.6.0 and Node 18.19.1 in this container. 2 minutes.

Self-hosted homelab infrastructure visualizer, interactive network diagram with live status monitoring

What the test found: Backend FastAPI app starts and responds to health checks, all 1512 backend tests pass, all 532 MCP tests pass; frontend build requires Node 20.19+ which is not available in this container. 58 minutes.

Project flat is the Web, Windows and macOS client of Agora Flat open source classroom.

What the test found: pnpm monorepo installed, flat-web Vite dev server runs and serves the React app with live TypeScript compilation on port 3000, Electron main process esbuild bundle compiles successfully. 28 minutes.