1. Inkscape 0.46 (http://inkscape.org/)
2. Karbon14 (http://www.koffice.org/karbon/)
3. Scribus v1.3.3.11 (http://www.scribus.net/)
4. Nodebox 1.9.4 (http://nodebox.net/)
5. Skencil 0.6.17 (http://www.skencil.org/)
6. Draw from openoffice.org.
7. Tgif 2-D drawing tool (For Linux and most UNIX platforms).
8. Xfig (on most UNIX-compatible platforms).
9. Ipe Extensible Drawing Editor (Visit homepage for installation instructions on many Platforms).
10. VRR Project (Unix).
via elanso

This set is a variety pack of free vector glass buttons and bars for your webpage or blog. Since they are in vector format, they can be easily manipulated and scaled to fit your layout without having to worry about pixellation.
via bittbox
via hongkiat