Figma

One of the best free wireframe tool is Figma, because of its open and diverse layout. Figma enables you to create multiple designs under one project. Figma is also considered as one of the best wireframe tools for wireframe design as it is not just a wireframe builder, it is also used for graphic designing and prototyping. The interface is such that you can easily design almost any website element with it.

Figma is free but limits only 3 project in free plan.