The standard libraries are foundations to build your own programs.
You may find details on those libraries in the wiki.
Some projects build on those foundations to provide upper-level libraries and tools:
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EWLC: the Eiffel Wrapper Library Collection
provides a SmartEiffel interface to widespread libraries such as GTK, Cairo...
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ESE: Enterprise SmartEiffel provides libraries and
tools useable in an enterprise context: extended XML tools, database access...
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USE: Useful SmartEiffel provides some tools, mainly
graphical.