Popular stencils
Bayes Elements
Mathematical elements for describing Bayes probabilities. Also includes stencils for sensors and platforms when using these elements for robotics or other applications.
Nucleotides
Visualize DNA-Sequences by norbertmueller@mac.com
Cisco CVD 2014 Data Center and Server Icons
Cisco released updated CVD Icons in many formats, but of course, no Omnigraffle stencil. These are built from the PNGs. http://www.cisco.com/c/en/us/solutions/enterprise/design-zone-smart-business-architecture/cvd.html This is the Data Center and Server Icons
Flat outline graffle
Flat, simple graffle for basic outlining
Theater Lighting Symbols
An old Theatre Lighting stencil used for drafting is converted for OmniGraffle
Cutting Line
Use this to include cutting lines in your document
Diagramming Reactive Systems
Graphical notation that is used to depict message flows from the Reactive Design Patterns book written by Roland Kuhn with Jamie Allen.
Concert Stage Objects
This stencil contains backline, monitor speakers, and other symbols for musicians.
Music Tab 2
tab shorter