ipe drawing tool

http://en.wikipedia.org/wiki/Ipe_%28program%29
 
*A drawing editor for creating figures in PDF or (encapsulated) Postscript (eps) format.


http://tclab.kaist.ac.kr/ipe/

ipe7.sourceforge.net/manual/manual.pdf

 
http://www.smashingmagazine.com/2008/12/05/20-vector-graphic-editors-reviewed/
 
http://yildizoglu.blogspot.in/2006/03/drawing-figures-for-latex-ipe.html