The swmmtoolbox is a Python script to read the Storm Water Management Model (SWMM) version 5 binary output files.
Python - of course
The 'mando' library which should have been installed as a requirement.
The 'tstoolbox' library and command line tool which should have been installed as a requirement.
The PANDAS library which normally comes installed as part of Python distributions such as Anaconda, Enthought, or Pythonxy.
Should be easy as pip install swmmtoolbox OR easy_install swmmtoolbox depending on your choice of Python package managers.