I've picked MockFlow WireFramePro, https://mockflow.com, as an easy-to-use, capable, and online tool that supports Material design UI elements and allows you to create multiple pages, which can then be linked together to create the illusion of a working application.
Most importantly, at the time of publishing, MockFlow allows one free project forever with the full feature set and capabilities available. This will give you a chance to truly vet the usefulness of the tool without artificial limits or a trial period that always seems to go by much quicker than you expect.
Balsamiq is the better-known wireframing tool. However, https://balsamiq.com doesn't offer any free usage, but if you are looking for a tool without a ...
