Popular stencils
HP Procurve
Here are a couple of HP Procurve stencils. 8200, 5400 and 3400.
Adobe Experience Manager (AEM) Dialogs and Widgets
An Adobe Experience Manager (AEM) AKA Adobe CQ wireframe stencil for creating authoring dialogs.
Ubiquiti
Official iconsets for creating diagrams that include Ubiquiti products.
Facebook Timeline v1.0
A series of stencils for Facebook Timeline Pages, and Timeline Tab Applications.
git
A template for drawing repository & branch diagrams, based on the figure style in Pro Git.
SysML
The last update SysML stencil is available at https://stenciltown.omnigroup.com/stencils/sysml/
Cogs
A simple stencil with two cogs.
iPad Wireframe Stencil
iPad wireframe components from the iPad Stencils Kit.
Apple iOS Hardware
A collection of 95 high resolution 512x512 iOS hardware icons that Apple uses in the Finder when Coverflow is active. All with transparent backgrounds. Updated with the iPhone 7's