Flowchart is a free kit for mobile wireframing that you can use to boost your productivity and save time. A Sketch freebie released by Dmitry Kurash.
Freebies tagged: wireframes
Here is the wireframe kit for iOS behind Uber app. Free Sketch file designed and released by John Francis.
A set of iPhone mockups for showcasing iOS apps built with smart object for quick edits. Free PSD released by Rubayath.
Teracy is a wireframe kit for Sketch app created to help speed up your wireframing process. Created and released by hoatle.
Here are some Apple Watch wireframes you may find useful to sketch your app. Free AI and PDF created and released by Jed Bridges.
A Nexus 5 wireframe template ready to be printed created with Photoshop. Free PSD released by Vivien Bocquelet.
A web wireframe layout that you can use as starter for designing your own template. Free PSD released by Dimple Bhavsar.
Some free PSD wireframes to prototype your website. You can combine components in various ways for different projects like portfolios, etc.
Here is a pixel-perfect iPhone5S wireframe mockup ready to be printed out. Free PSD created by Gavin Anthony.