Popular stencils
Flip-flop Gates
Flip-flop boolean gates. Includes RS, D, T and JK latches.
Juniper M and MX series stencils
Stencils for Juniper M and MX series routers. Sized for 19" racks, works well with RackElements
Web Sketch Social Media Badges
Social Media badges in a "sketch" style, for mocking up web UX designs. Includes: Twitter, Facebook, StumbleUpon, Delicious, Digg, Reddit, Linkedin, MySpace, FriendFeed, RSS, Flickr, Technorati, YouTube, Bebo, and Pinterest.
Macbook keyboard
High quality Mac keyboard based on late 2013 MacBook Pro model. Useful for explaining button combinations or writing tutorials. Mac, Apple, MacBook Pro and mac keyboard are copyright of Apple Inc. Example of usage: www.howtoscreenshotonamac.com
Tableau Électrique
Stencil for diagramming switchboards.
Petri nets
A stencil for creating Petri nets diagrams (for predicate/transition, or PT, nets)
Microsoft Azure
This is a Stencil for Microsoft Azure Cloud Platform based on icons shared by on David Pallmann. Hope this helps someone. http://davidpallmann.blogspot.ca/2011/09/windows-azure-design-pattern-icons.html
Cassette Tape
Classic compact cassette tape stencil to scale.
Nucl-AA-solid
Stencil for nucleotide and amino acid residues. Solid symbols.