Popular stencils
Medium Grids (Magnolia CMS)
Medium Grid Layouts from the Magnolia CMS Standard Templating Kit (STK) Stencil kit.
Spiral planner
Spiral planner heavily inspired by Kent from Oz idea: http://kentfromoz.blogspot.se/2013/04/filofaxuations-mind-mapping-and-filofax.html
Google Compute Platform
This stencil contains icons for Google Compute created from: https://cloud.google.com/icons/
Cisco Network Topology
The standard Cisco Network Topology icons
iPad iOS 7 Stencil
iPad iOS 7 user interface components from the iPad Stencils Kit.
Apple Icons 2 (Large)
A set of large application and system icons from Mac OS X (Part 2).
Feature Diagrams
Feature Diagram stencil, notation based on the book "Generative Programming" by K. Czarnecki and U.W. Eisenecker. Updated, version 2 improves quality (circles do no longer overlap connected boxes).
Floorplans: Plumbing Fixtures
A handy collection of plumbing fixtures for laying out basic floorplans.
Sound Design for Theatre/Concerts/Events
Stencil file for creating rack drawings for sound system designs for sound reinforcement. Includes stencil file with rack gear, blanks, vents, racks, and shock racks. See website for more info and a template file including plate block and title block.