Packages for generating figures (esp. plate diagrams)

- Inkscape
- latex
    - pstricks
    - tikz (http://www.mpi-inf.mpg.de/~dietz/probabilistic-models-tikz.zip, http://www.mpi-inf.mpg.de/~dietz/dirfactor-notation.pdf)
    - TikZ and PGF
- xfig
- jPicEdt
- lpe (http://tclab.kaist.ac.kr/ipe/)
- omnigraffle (not free) (http://www.omnigroup.com/products/omnigraffle/)