Tldraw is an infinite canvas SDK designed for React developers. It allows developers to add collaborative whiteboard functionality or create new canvas-based experiences within their products. The SDK includes components, APIs, and services that support building high-performance, customizable canvas applications. Tldraw is praised for its powerful features, real-time collaboration capabilities, and developer-friendly design. It is suitable for various applications requiring complex canvas interactions on the web, from personal projects to enterprise-level solutions. Tldraw offers a free version with watermarks and paid plans to remove watermarks and gain additional support.