docs/hacking/directory-layout/tools.rst

``tools/`` - Development helper packages
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``discover.python/``
``discover.lxml/``
``discover.jre/``
``discover.lo/``
``install.jython/``

   Discover multiple python versions, lxml, JRE, Libreoffice to use in the
   developement environment. Provides zc.buildout recipes.

``xsltest/``

   an XSLT test runner.

``oxt.tool/``

   Build and test .oxt packages with the LibreOffice.