Inkscape: an open source vector graphics editor similar to Illustrator, CorelDraw, or Xara X. Inkscape uses the W3C standard Scalable Vector Graphics (SVG) file format and it supports many advanced SVG features (markers, clones, alpha blending, etc.). Finally, the streamlined interface is easy to use to edit nodes, perform complex path operations, trace bitmaps and much more.
GIMP: Even if you’re paying for upgrades instead of the original package, the price for Adobe’s Photoshop can be prohibitive for some photographers and graphic designers. Try GIMP to see if this open source tool can’t provide you with all the power you need for your photography and graphic design needs. GIMP stands for Gnu Image Manipulation Program, and it’s the solution that comes closest to emulating the Photoshop environment.
Avidemux: provides Windows, Mac, and Linux users with an easy-to-use open source tool for DVD/DivX converting and editing. Avidemux also has scripting support for automation and even offers DVD authoring with the addition of the open source software, dvdauthor.
Archimedes: is an open source computer aided design (CAD) alternative that focuses primarily on architectural design. AutoCAD definitely has the winning score thus far, but Archimedes shows promise. The latter program contains all the drawing features a designer would need, but its interoperability is weak. Designers still can export scalable vector graphics, so there’s a real market for this open source tool (this opinion isn’t based upon Archimedes’ newest release).
This information was borrowed from http://whdb.com
