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==  Ubuntu Development Tools  ==
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check-symbols <package> [<directory>]
    ... will compare and give you a diff of the exported symbols of all .so 
    files in all binary packages of <package>. 
    <directory> is not mandatory and set to /var/cache/pbuilder/result by default.

what-patch
    ... will check what patching system is used by a package.
    You need to be in it's source directory in order that it works.

suspicious-source
   ... will output a list of files which are not common source files. This
   should be run in the root of a source tree to find files which might
   not be the 'prefered form of modification' that the GPL and other
   licenses require.