openbabel  2.4.1
About: Open Babel is a chemical toolbox designed to speak the many languages of chemical data. It’s an open, collaborative project allowing anyone to search, convert, analyze, or store data from molecular modeling, chemistry, solid-state materials, biochemistry, or related areas.
  Fossies Dox: openbabel-2.4.1.tar.gz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

Kasper Peeters
See also

The tree.hh library for C++ provides an STL-like container class for n-ary trees, templated over the data stored at the nodes. Various types of iterators are provided (post-order, pre-order, and others). Where possible the access methods are compatible with the STL or alternative algorithms are available.