http://www.kvec.de/english/index.htm
 binary only?
 http://www.kvec.de/kvec_win.zip
 http://www.kvec.de/kvec_l.tgz
 http://www.kvec.de/kvec_l64.tgz

http://xmailserver.org/davide.html
 -> http://xmailserver.org/ras2vec.zip

autotracer.org
  This tool uses the fantastic autotrace library developed by Martin Weber

http://linetracer.sourceforge.net/
  -> https://netcologne.dl.sourceforge.net/project/linetracer/linetracer/v0.2.1/LineTracer-v0.2.1.exe
  -> svn checkout https://svn.code.sf.net/p/linetracer/code/trunk linetracer-code

