Popular stencils
UML 2.1 Collection
A collection of notation elements for creating UML 2 class, activity, use case, sequence, or component diagrams. It's a rather large stencil, but it contains most UML 2.1 elements. A tool converting Eclipse Java packages to UML class diagrams using this collection can be found on the linked website. Version history: 1.11 (Jun...more
Aquaticus Social Icons
These are very clean "Aqua" social icons. I created the stencil after using the icons for various prototyping projects. Follow me on Twitter http://twitter.com/phantomflyer
OS logos
A collection of OS/hardware logos, including Sun, HP, Linux, Red Hat, FreeBSD, Windows, Debian, Darwin, IBM, and VMware.
iPhone Sketch
This is a stencil for quick sketching of iPhone ideas. Use the outline for printouts so you can hand sketch as well. The symbols are meant as a check list for included features in your app development. Visit www.iphonepool.com and join in:-) Please leave a comment, nice to know if it's usable for others.
Web Flowchart
Charles Parcell has created a very slick set of stencils for website flowcharting that has just about every component you might use for a site, from Flash to PHP to .Net. And all of them in a unique, colored style. Awesome.
Best Practice UX Forms Stencil v2.0
This is the third, even more comprehensive release of this stencil which follows best practice UX form design principles, providing three different ways of laying forms out, each with their own benefits. This version also provides various controls and fields including multiple CAPTCHA fields, social networking buttons and more.
Web Sketch Interface v2
Use to mockup prototype that separate "Conceptual" from "Graphic" design. This is in the same series as Mac OS X Sketch Application. Update grouping for easy drag drop.
Little People
Lots of colorful little people to use in your work. I built these to help illustrate wireframes for Lulu.com.
Web Page Elements
Using the open-source "Bitstream Vera" font set and free icons from FamFamFam, you should have most of your common web page elements covered, including headings, form elements, content management function, image placeholders, etc.