WBO (Whitebophir) is an online collaborative whiteboard that allows multiple people to draw and annotate together in real time on a shared surface. Designed for simplicity, it opens in a browser without any client-side installation or account creation : simply share a board's URL to collaborate instantly.

The tool offers a palette of essential drawing instruments : freehand pencil, line, rectangle, ellipse, text, and eraser. Every change is immediately broadcast to all participants, and the board state is preserved on the server : you can pick up your diagram exactly where you left it from one session to the next. Multiple independent boards can coexist, each identified by its own shareable URL.

Lightweight and performant, WBO is built on a Node.js architecture and is released under the free AGPL-3.0 license. This simplicity makes it an ideal service for self-hosting : it runs on a modest instance while supporting numerous simultaneous sessions, ensuring controlled costs and complete control over your content.