Open source. Open possibilities.

Fibonacci sequence visualizer creating aesthetically pleasing mathematical graphics from numerical patterns.

RAWGraphs is an open-source web tool for creating custom vector-based data visualizations from tabular data, built on d3.js. It runs entirely in the browser with no server-side processing, and exports editable SVG output.

Decklight is a zero-dependency, agent-native presentation library where presentations are stored as single HTML files. It features plain-text authoring, Keynote-style builds, theme-aware SVG diagrams, and automated verification through headless rendering.

D2 is a modern diagram scripting language that converts text into diagrams. It supports multiple layout engines, themes, and export formats including SVG, PNG, and PDF.

ChartDB is an open-source, web-based database diagram editor that lets you visualize schemas instantly with a single query. No installation or password needed. Supports multiple databases and AI-powered SQL export.

ICERender is a TypeScript-based Canvas 2D interactive graphics rendering engine for ER diagrams, flowcharts, and topology maps, featuring a React-like component model, nested coordinate systems, and Visio-style connectors.

draw.io is a configurable JavaScript-based client-side editor for general diagramming and whiteboarding.

AFFiNE is an open-source, privacy-focused workspace that merges documents, whiteboards, and databases into a single local-first platform for knowledge management and planning.

A Next.js web app that combines AI with draw.io diagrams, letting users create and edit diagrams via natural language, replicate uploaded images or PDFs, and view AI reasoning. Supports many LLM providers, an MCP server, Docker, desktop builds, and one-click deployment.

A free, browser-based database entity relationship diagram (ERD) editor and SQL generator.

Visualize every road in any city at once using OpenStreetMap data. Includes a web app, scripting API, and local development setup.

An Agent Skills-compatible skill that turns natural language, code, Terraform/K8s, SQL, OpenAPI, AsyncAPI, Protobuf and GraphQL into editable, tested draw.io architecture diagrams with incremental sync, multi-view projection, drift diff, CI architecture tests, and interactive HTML/PPTX/Mermaid exports.

Antares is an open-source digital circuit learning platform written in Kotlin. It provides tools to design and simulate digital circuits with embedded explanations, featuring a Swing-based desktop application.

39 editorial diagram types as self-contained HTML+SVG for AI coding assistants like Claude Code and Codex. Brand-matched, accessible, no build step. Import from draw.io, Mermaid, or Excalidraw.

Drawnix is an open-source all-in-one whiteboard tool supporting mind maps, flowcharts, and freehand drawing, designed to provide a flexible and extensible space for creative expression.

Mermaid is a JavaScript diagramming tool that renders Markdown-inspired text into flowcharts, sequence diagrams, class diagrams, Gantt charts, pie charts, Git graphs, mindmaps and more. It offers a live editor, GitHub integration, version-control-friendly text, theme customization and sandboxed rendering.

React Flow and Svelte Flow are MIT-licensed open source libraries from the xyflow team for building node-based user interfaces with React or Svelte. They ship ready-to-use nodes, edges, minimap, controls and backgrounds that stay infinitely customizable.

An open-source virtual whiteboard designed for creating hand-drawn style diagrams, wireframes, and sketches with collaborative and encrypted features.

tldraw is an open-source React SDK for building infinite canvas apps, offering drawing/diagramming tools, self-hostable multiplayer sync, custom shapes/tools, and AI integration starter kits.

drawio-desktop is an offline-first Electron desktop app for creating diagrams, flowcharts, and visual designs locally without external data transmission.