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  1. Maxima. Computer Algebra System. I contribute mainly to the graphical interfaces, Xmaxima and Dynamical Systems packages.

  2. Moodle. I have done the Portuguese translation.

  3. Wikiup. "Wiki" system with CVS version control system (used to create this site).

  4. psimage. Drawing system based in PostScript.

  5. Parsewiki. A simple document preparation system, based on a text mark-up syntax.

  6. xhtmltools. Document preparation system based on XHTML and XSLT.