Popular stencils
Free
A10 Networks
Stencil for A10 Networks Thunder Series Platforms.
Free
Media Space
Tables, chairs, and media board objects (from the Media Computing Group).
Free
Sun Microsystems - Systems '07
Some current Sun Microsystems servers
Free
Problem Frames
Stencil for diagramming problem frames.
Free
Windows 8: App bars
App bars for Windows 8.
Free
Card pack A
Card deck design I made to make it easier to see what each card is in a diagram.
Free
Calc Elec
U=RI and Co
Free
Boyd Hobbs' Tungsten
Tungsten Lights (Pars, Open Face and Soft Lights and Fresnels)
Free
Emotions by Anna
I drew these for my blog and thought they might be of use or for fun. :-) They are vector-based so you can change the colours & shapes.