Helpful article that includes a free download of the Devbridge Group Starter Wireframe Templates:

“At the start of a project, we usually need to make wireframes in some form or another. What this entails depends on the project. Sometimes simple pencil or whiteboard sketches are all that are needed. However, larger, more complex projects often require a high-fidelity deck with annotations. To save time and have consistency across our organization, we have created a number of templates…”