draw.io (diagrams.net)
Free diagram maker for flowcharts, org charts, UML, and network diagrams — works offline
⭐
42k
Design & Creative⭐TypeScriptMIT
Excalidraw
Hand-drawn style virtual whiteboard for diagrams, sketches, and collaborative brainstorming
Editor's Take
Excalidraw is the diagram tool you reach for when you need something fast, expressive, and instantly shareable. The hand-drawn style gives even rough sketches a deliberate, intentional look that feels more approachable than corporate diagram tools. You open it in a browser, start drawing, and collaborate in real time with end-to-end encryption — no signup, no installation, no friction. The library of shapes, icons, and templates covers everything from simple flowcharts to complex architecture diagrams. What makes Excalidraw special is how it balances simplicity with power: a non-technical person can use it immediately, while the API and embedding options let developers integrate it into their own tools. The real-time collaboration is smooth enough for actual brainstorming sessions. It's not a replacement for Visio when you need formal diagrams, but for the 90% of diagramming that happens during meetings and planning, it's exactly what you need.
Good first choice if you want a practical tool without spending the afternoon reading developer docs.
Start Here
Why It Stands Out
- 1Instantly usable in browser — no signup or installation required
- 2Real-time collaboration with end-to-end encryption
- 3Rich library of shapes, icons, and hand-drawn style elements
Best Use Cases
Quick diagram for docs
Create architecture diagrams for documentation with the signature hand-drawn look
Team brainstorming
Collaborative whiteboard sessions with remote team members in real-time
Plain-English Buying Guide
Excalidraw is a good candidate for individuals, teams, non developers who want an open source option in the design & creative category. The key question is not whether the repository is popular. The better question is whether it removes a real friction point from your day: replacing a paid SaaS tool, keeping more data under your control, speeding up a repeated task, or giving a team a workflow they can inspect and adapt.
Excalidraw is most useful when your goal matches one of its real use cases rather than when you are simply browsing popular repositories. Start by checking whether "quick diagram for docs" sounds like your situation. If it does, read the install guide, try the smallest possible setup, and only then decide whether to bring it into a personal workflow or team stack. The project is tagged around diagramming, whiteboard, collaboration, no-code, which gives you a quick sense of the ecosystem it belongs to. It can also fit "team brainstorming", but that second path may require a different setup or expectation.
Before You Install
Excalidraw is one of the easier projects in this category to try first. You should still check the official installation page, but the expected path is closer to downloading an app, running a simple command, or following a guided setup than maintaining a complex server.
Check the MIT license, the TypeScript ecosystem, and the latest activity on GitHub before using it for important work.
When to Skip It
Skip it for now if your current tool already solves the same problem well. Open source is most valuable when it gives you privacy, flexibility, cost savings, or a workflow improvement you cannot get from your existing setup.
If you are unsure, compare it with the similar projects below before spending time on a full setup.
Who Should Try It
individualsteamsnon developers
Similar Projects
#diagramming#whiteboard#collaboration#no-code